Enforce Firefox Developer Edition as my default browser











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0
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Disclaimer: I have read the other questions relative to my issue (1, 2, 3, 4, etc.). However, I still have trouble keeping FDE as my default web browser.




Background



I have successfully installed Firefox Developer Edition (FDE) in /opt/firefox_dev/. It runs well, is up-to-date (64.0b11 (64-bit) on aurora channel),…



I have also created the file ~/.local/share/applications/firefox_dev.desktop, which content is:



[Desktop Entry]

Name=Firefox Developer Ed

GenericName=Firefox Developer Ed

Exec=/opt/firefox_dev/firefox %u

Terminal=false

Icon=/opt/firefox_dev/browser/chrome/icons/default/default128.png

Type=Application

Categories=Application;Network;X-Developer;

Comment=Firefox Developer Ed Web Browser.

StartupWMClass=Firefox Developer Edition


I have only a handful of mimeapps.list files — one of which I'm supposed to modify: ~/.config/mimeapps.list. Its content is:



[Default Applications]

x-scheme-handler/mailto=thunderbird.desktop

message/rfc822=thunderbird.desktop

text/xml=firefox_dev.desktop

application/xml=firefox_dev.desktop

application/rss+xml=firefox_dev.desktop

application/rdf+xml=firefox_dev.desktop

image/gif=org.gnome.gThumb.desktop

image/jpeg=org.gnome.gThumb.desktop

image/png=org.gnome.gThumb.desktop

video/webm=firefox_dev.desktop

application/x-xpinstall=firefox_dev.desktop

image/bmp=org.gnome.gThumb.desktop

image/tiff=org.gnome.gThumb.desktop

image/x-bmp=org.gnome.gThumb.desktop

image/x-ico=org.gnome.gThumb.desktop

image/x-png=org.gnome.gThumb.desktop

image/x-pcx=org.gnome.gThumb.desktop

image/x-tga=org.gnome.gThumb.desktop

image/xpm=org.gnome.gThumb.desktop

image/svg+xml=org.gnome.gThumb.desktop

audio/x-vorbis+ogg=vlc.desktop

audio/ogg=vlc.desktop

audio/vorbis=vlc.desktop

audio/x-vorbis=vlc.desktop

audio/x-speex=vlc.desktop

audio/opus=vlc.desktop

audio/flac=vlc.desktop

audio/x-flac=vlc.desktop

audio/x-ms-asf=vlc.desktop

audio/x-ms-asx=vlc.desktop

audio/x-ms-wax=vlc.desktop

audio/x-ms-wma=vlc.desktop

audio/x-pn-windows-acm=vlc.desktop

audio/vnd.rn-realaudio=vlc.desktop

audio/x-pn-realaudio=vlc.desktop

audio/x-pn-realaudio-plugin=vlc.desktop

audio/x-real-audio=vlc.desktop

audio/x-realaudio=vlc.desktop

audio/mpeg=vlc.desktop

audio/mpg=vlc.desktop

audio/mp1=vlc.desktop

audio/mp2=vlc.desktop

audio/mp3=vlc.desktop

audio/x-mp1=vlc.desktop

audio/x-mp2=vlc.desktop

audio/x-mp3=vlc.desktop

audio/x-mpeg=vlc.desktop

audio/x-mpg=vlc.desktop

audio/aac=vlc.desktop

audio/m4a=vlc.desktop

audio/mp4=vlc.desktop

audio/x-m4a=vlc.desktop

audio/x-aac=vlc.desktop

audio/x-matroska=vlc.desktop

audio/webm=vlc.desktop

audio/3gpp=vlc.desktop

audio/3gpp2=vlc.desktop

audio/AMR=vlc.desktop

audio/AMR-WB=vlc.desktop

audio/mpegurl=vlc.desktop

audio/x-mpegurl=vlc.desktop

audio/scpls=vlc.desktop

audio/x-scpls=vlc.desktop

audio/dv=vlc.desktop

audio/x-aiff=vlc.desktop

audio/x-pn-aiff=vlc.desktop

audio/wav=vlc.desktop

audio/x-pn-au=vlc.desktop

audio/x-pn-wav=vlc.desktop

audio/x-wav=vlc.desktop

audio/x-adpcm=vlc.desktop

audio/ac3=vlc.desktop

audio/eac3=vlc.desktop

audio/vnd.dts=vlc.desktop

audio/vnd.dts.hd=vlc.desktop

audio/vnd.dolby.heaac.1=vlc.desktop

audio/vnd.dolby.heaac.2=vlc.desktop

audio/vnd.dolby.mlp=vlc.desktop

audio/basic=vlc.desktop

audio/midi=vlc.desktop

audio/x-ape=vlc.desktop

audio/x-gsm=vlc.desktop

audio/x-musepack=vlc.desktop

audio/x-tta=vlc.desktop

audio/x-wavpack=vlc.desktop

audio/x-shorten=vlc.desktop

audio/x-it=vlc.desktop

audio/x-mod=vlc.desktop

audio/x-s3m=vlc.desktop

audio/x-xm=vlc.desktop



[Added Associations]

x-scheme-handler/mailto=thunderbird.desktop

message/rfc822=thunderbird.desktop

image/jpeg=inkscape.desktop;gimp.desktop;firefox_dev.desktop;

text/css=atom.desktop;

application/x-subrip=atom.desktop;

image/png=gimp.desktop;inkscape.desktop;eog.desktop;firefox_dev.desktop;org.gnome.gThumb.desktop;

x-scheme-handler/http=firefox_dev.desktop;

x-scheme-handler/https=firefox_dev.desktop;

x-scheme-handler/ftp=firefox_dev.desktop;

x-scheme-handler/chrome=firefox_dev.desktop;

text/html=firefox_dev.desktop;

application/x-extension-htm=firefox_dev.desktop;

application/x-extension-html=firefox_dev.desktop;

application/x-extension-shtml=firefox_dev.desktop;

application/xhtml+xml=firefox_dev.desktop;

application/x-extension-xhtml=firefox_dev.desktop;

application/x-extension-xht=firefox_dev.desktop;

text/csv=atom.desktop;

application/pdf=pdfshuffler.desktop;inkscape.desktop;

text/xml=firefox_dev.desktop;

application/xml=firefox_dev.desktop;

application/rss+xml=firefox_dev.desktop;

application/rdf+xml=firefox_dev.desktop;

image/gif=firefox_dev.desktop;org.gnome.gThumb.desktop;

video/webm=vlc.desktop;firefox_dev.desktop;

application/x-xpinstall=firefox_dev.desktop;

application/postscript=evince.desktop;inkscape.desktop;

image/x-eps=gimp.desktop;inkscape.desktop;

image/svg+xml=inkscape.desktop;org.gnome.gThumb.desktop;

image/bmp=org.gnome.gThumb.desktop;

image/tiff=org.gnome.gThumb.desktop;

image/x-bmp=org.gnome.gThumb.desktop;

image/x-ico=org.gnome.gThumb.desktop;

image/x-png=org.gnome.gThumb.desktop;

image/x-pcx=org.gnome.gThumb.desktop;

image/x-tga=org.gnome.gThumb.desktop;

image/xpm=org.gnome.gThumb.desktop;

audio/ogg=vlc.desktop;

audio/vorbis=vlc.desktop;

audio/x-vorbis=vlc.desktop;

audio/x-speex=vlc.desktop;

audio/opus=vlc.desktop;

audio/flac=vlc.desktop;

audio/x-flac=vlc.desktop;

audio/x-ms-asf=vlc.desktop;

audio/x-ms-asx=vlc.desktop;

audio/x-ms-wax=vlc.desktop;

audio/x-ms-wma=vlc.desktop;

audio/x-pn-windows-acm=vlc.desktop;

audio/vnd.rn-realaudio=vlc.desktop;

audio/x-pn-realaudio=vlc.desktop;

audio/x-pn-realaudio-plugin=vlc.desktop;

audio/x-real-audio=vlc.desktop;

audio/x-realaudio=vlc.desktop;

audio/mpeg=vlc.desktop;

audio/mpg=vlc.desktop;

audio/mp1=vlc.desktop;

audio/mp2=vlc.desktop;

audio/mp3=vlc.desktop;

audio/x-mp1=vlc.desktop;

audio/x-mp2=vlc.desktop;

audio/x-mp3=vlc.desktop;

audio/x-mpeg=vlc.desktop;

audio/x-mpg=vlc.desktop;

audio/aac=vlc.desktop;

audio/m4a=vlc.desktop;

audio/mp4=vlc.desktop;

audio/x-m4a=vlc.desktop;

audio/x-aac=vlc.desktop;

audio/x-matroska=vlc.desktop;

audio/webm=vlc.desktop;

audio/3gpp=vlc.desktop;

audio/3gpp2=vlc.desktop;

audio/AMR=vlc.desktop;

audio/AMR-WB=vlc.desktop;

audio/mpegurl=vlc.desktop;

audio/x-mpegurl=vlc.desktop;

audio/scpls=vlc.desktop;

audio/x-scpls=vlc.desktop;

audio/dv=vlc.desktop;

audio/x-aiff=vlc.desktop;

audio/x-pn-aiff=vlc.desktop;

audio/wav=vlc.desktop;

audio/x-pn-au=vlc.desktop;

audio/x-pn-wav=vlc.desktop;

audio/x-wav=vlc.desktop;

audio/x-adpcm=vlc.desktop;

audio/ac3=vlc.desktop;

audio/eac3=vlc.desktop;

audio/vnd.dts=vlc.desktop;

audio/vnd.dts.hd=vlc.desktop;

audio/vnd.dolby.heaac.1=vlc.desktop;

audio/vnd.dolby.heaac.2=vlc.desktop;

audio/vnd.dolby.mlp=vlc.desktop;

audio/basic=vlc.desktop;

audio/midi=vlc.desktop;

audio/x-ape=vlc.desktop;

audio/x-gsm=vlc.desktop;

audio/x-musepack=vlc.desktop;

audio/x-tta=vlc.desktop;

audio/x-wavpack=vlc.desktop;

audio/x-shorten=vlc.desktop;

audio/x-it=vlc.desktop;

audio/x-mod=vlc.desktop;

audio/x-s3m=vlc.desktop;

audio/x-xm=vlc.desktop;

application/x-desktop=atom.desktop;

application/x-sharedlib=atom.desktop;

application/x-executable=atom.desktop;


Problem



When I log in and then open FDE via its launcher, I'm asked whether I'd like to make FDE as default browser as it isn't currently the case. When I click on "Use FDE as my default browser", I got these lines appended to the [Default application] section of ~/.config/mimeapps.list:



[...]

x-scheme-handler/http=userapp-Firefox Developer Edition-803SSZ.desktop

x-scheme-handler/https=userapp-Firefox Developer Edition-803SSZ.desktop

x-scheme-handler/ftp=userapp-Firefox Developer Edition-803SSZ.desktop

x-scheme-handler/chrome=userapp-Firefox Developer Edition-803SSZ.desktop

text/html=userapp-Firefox Developer Edition-803SSZ.desktop

application/x-extension-htm=userapp-Firefox Developer Edition-803SSZ.desktop

application/x-extension-html=userapp-Firefox Developer Edition-803SSZ.desktop

application/x-extension-shtml=userapp-Firefox Developer Edition-803SSZ.desktop

application/xhtml+xml=userapp-Firefox Developer Edition-803SSZ.desktop

application/x-extension-xhtml=userapp-Firefox Developer Edition-803SSZ.desktop

application/x-extension-xht=userapp-Firefox Developer Edition-803SSZ.desktop

[...]


Moreover, the same new *.desktop is appended in [Added Associations]:



[Added Associations]

x-scheme-handler/mailto=thunderbird.desktop

message/rfc822=thunderbird.desktop

image/jpeg=inkscape.desktop;gimp.desktop;firefox_dev.desktop;

text/css=atom.desktop;

application/x-subrip=atom.desktop;

image/png=gimp.desktop;inkscape.desktop;eog.desktop;firefox_dev.desktop;org.gnome.gThumb.desktop;

x-scheme-handler/http=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;

x-scheme-handler/https=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;

x-scheme-handler/ftp=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;

x-scheme-handler/chrome=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;

text/html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;

application/x-extension-htm=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;

application/x-extension-html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;

application/x-extension-shtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;

application/xhtml+xml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;

application/x-extension-xhtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;

application/x-extension-xht=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;

[...]


If I close FDE (or even re-log) and opens it again, it works fine.



However, if I click on a hyperlink in Thunderbird, FDE opens, but asks again to set it as my default browser. ~/.config/mimeapps.list now becomes:



[...]

x-scheme-handler/http=thunderbird.desktop

x-scheme-handler/https=thunderbird.desktop

x-scheme-handler/ftp=thunderbird.desktop

x-scheme-handler/chrome=thunderbird.desktop

text/html=thunderbird.desktop

application/x-extension-htm=thunderbird.desktop

application/x-extension-html=thunderbird.desktop

application/x-extension-shtml=thunderbird.desktop

application/xhtml+xml=thunderbird.desktop

application/x-extension-xhtml=thunderbird.desktop

application/x-extension-xht=thunderbird.desktop



[Added Associations]

x-scheme-handler/mailto=thunderbird.desktop

message/rfc822=thunderbird.desktop

image/jpeg=inkscape.desktop;gimp.desktop;firefox_dev.desktop;

text/css=atom.desktop;

application/x-subrip=atom.desktop;

image/png=gimp.desktop;inkscape.desktop;eog.desktop;firefox_dev.desktop;org.gnome.gThumb.desktop;

x-scheme-handler/http=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;

x-scheme-handler/https=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;

x-scheme-handler/ftp=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;

x-scheme-handler/chrome=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;

text/html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;

application/x-extension-htm=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;

application/x-extension-html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;

application/x-extension-shtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;

application/xhtml+xml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;

application/x-extension-xhtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;

application/x-extension-xht=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;

[...]


Obviously, if I close FDE and re-opens it via the desktop launcher, I'm asked again to set it as my default browser…



Question



➥ How to definitively set up FDE as my default browser?



(And, as a side question: "Why is even a userapp-Firefox Developer Edition-803SSZ.desktop created?")






18.04 firefox launcher default-programs default-browser







share|improve this question


























    up vote
    0
    down vote

    favorite












    Disclaimer: I have read the other questions relative to my issue (1, 2, 3, 4, etc.). However, I still have trouble keeping FDE as my default web browser.




    Background



    I have successfully installed Firefox Developer Edition (FDE) in /opt/firefox_dev/. It runs well, is up-to-date (64.0b11 (64-bit) on aurora channel),…



    I have also created the file ~/.local/share/applications/firefox_dev.desktop, which content is:



    [Desktop Entry]
    
Name=Firefox Developer Ed
    
GenericName=Firefox Developer Ed
    
Exec=/opt/firefox_dev/firefox %u
    
Terminal=false
    
Icon=/opt/firefox_dev/browser/chrome/icons/default/default128.png
    
Type=Application
    
Categories=Application;Network;X-Developer;
    
Comment=Firefox Developer Ed Web Browser.
    
StartupWMClass=Firefox Developer Edition


    I have only a handful of mimeapps.list files — one of which I'm supposed to modify: ~/.config/mimeapps.list. Its content is:



    [Default Applications]
    
x-scheme-handler/mailto=thunderbird.desktop
    
message/rfc822=thunderbird.desktop
    
text/xml=firefox_dev.desktop
    
application/xml=firefox_dev.desktop
    
application/rss+xml=firefox_dev.desktop
    
application/rdf+xml=firefox_dev.desktop
    
image/gif=org.gnome.gThumb.desktop
    
image/jpeg=org.gnome.gThumb.desktop
    
image/png=org.gnome.gThumb.desktop
    
video/webm=firefox_dev.desktop
    
application/x-xpinstall=firefox_dev.desktop
    
image/bmp=org.gnome.gThumb.desktop
    
image/tiff=org.gnome.gThumb.desktop
    
image/x-bmp=org.gnome.gThumb.desktop
    
image/x-ico=org.gnome.gThumb.desktop
    
image/x-png=org.gnome.gThumb.desktop
    
image/x-pcx=org.gnome.gThumb.desktop
    
image/x-tga=org.gnome.gThumb.desktop
    
image/xpm=org.gnome.gThumb.desktop
    
image/svg+xml=org.gnome.gThumb.desktop
    
audio/x-vorbis+ogg=vlc.desktop
    
audio/ogg=vlc.desktop
    
audio/vorbis=vlc.desktop
    
audio/x-vorbis=vlc.desktop
    
audio/x-speex=vlc.desktop
    
audio/opus=vlc.desktop
    
audio/flac=vlc.desktop
    
audio/x-flac=vlc.desktop
    
audio/x-ms-asf=vlc.desktop
    
audio/x-ms-asx=vlc.desktop
    
audio/x-ms-wax=vlc.desktop
    
audio/x-ms-wma=vlc.desktop
    
audio/x-pn-windows-acm=vlc.desktop
    
audio/vnd.rn-realaudio=vlc.desktop
    
audio/x-pn-realaudio=vlc.desktop
    
audio/x-pn-realaudio-plugin=vlc.desktop
    
audio/x-real-audio=vlc.desktop
    
audio/x-realaudio=vlc.desktop
    
audio/mpeg=vlc.desktop
    
audio/mpg=vlc.desktop
    
audio/mp1=vlc.desktop
    
audio/mp2=vlc.desktop
    
audio/mp3=vlc.desktop
    
audio/x-mp1=vlc.desktop
    
audio/x-mp2=vlc.desktop
    
audio/x-mp3=vlc.desktop
    
audio/x-mpeg=vlc.desktop
    
audio/x-mpg=vlc.desktop
    
audio/aac=vlc.desktop
    
audio/m4a=vlc.desktop
    
audio/mp4=vlc.desktop
    
audio/x-m4a=vlc.desktop
    
audio/x-aac=vlc.desktop
    
audio/x-matroska=vlc.desktop
    
audio/webm=vlc.desktop
    
audio/3gpp=vlc.desktop
    
audio/3gpp2=vlc.desktop
    
audio/AMR=vlc.desktop
    
audio/AMR-WB=vlc.desktop
    
audio/mpegurl=vlc.desktop
    
audio/x-mpegurl=vlc.desktop
    
audio/scpls=vlc.desktop
    
audio/x-scpls=vlc.desktop
    
audio/dv=vlc.desktop
    
audio/x-aiff=vlc.desktop
    
audio/x-pn-aiff=vlc.desktop
    
audio/wav=vlc.desktop
    
audio/x-pn-au=vlc.desktop
    
audio/x-pn-wav=vlc.desktop
    
audio/x-wav=vlc.desktop
    
audio/x-adpcm=vlc.desktop
    
audio/ac3=vlc.desktop
    
audio/eac3=vlc.desktop
    
audio/vnd.dts=vlc.desktop
    
audio/vnd.dts.hd=vlc.desktop
    
audio/vnd.dolby.heaac.1=vlc.desktop
    
audio/vnd.dolby.heaac.2=vlc.desktop
    
audio/vnd.dolby.mlp=vlc.desktop
    
audio/basic=vlc.desktop
    
audio/midi=vlc.desktop
    
audio/x-ape=vlc.desktop
    
audio/x-gsm=vlc.desktop
    
audio/x-musepack=vlc.desktop
    
audio/x-tta=vlc.desktop
    
audio/x-wavpack=vlc.desktop
    
audio/x-shorten=vlc.desktop
    
audio/x-it=vlc.desktop
    
audio/x-mod=vlc.desktop
    
audio/x-s3m=vlc.desktop
    
audio/x-xm=vlc.desktop
    

    
[Added Associations]
    
x-scheme-handler/mailto=thunderbird.desktop
    
message/rfc822=thunderbird.desktop
    
image/jpeg=inkscape.desktop;gimp.desktop;firefox_dev.desktop;
    
text/css=atom.desktop;
    
application/x-subrip=atom.desktop;
    
image/png=gimp.desktop;inkscape.desktop;eog.desktop;firefox_dev.desktop;org.gnome.gThumb.desktop;
    
x-scheme-handler/http=firefox_dev.desktop;
    
x-scheme-handler/https=firefox_dev.desktop;
    
x-scheme-handler/ftp=firefox_dev.desktop;
    
x-scheme-handler/chrome=firefox_dev.desktop;
    
text/html=firefox_dev.desktop;
    
application/x-extension-htm=firefox_dev.desktop;
    
application/x-extension-html=firefox_dev.desktop;
    
application/x-extension-shtml=firefox_dev.desktop;
    
application/xhtml+xml=firefox_dev.desktop;
    
application/x-extension-xhtml=firefox_dev.desktop;
    
application/x-extension-xht=firefox_dev.desktop;
    
text/csv=atom.desktop;
    
application/pdf=pdfshuffler.desktop;inkscape.desktop;
    
text/xml=firefox_dev.desktop;
    
application/xml=firefox_dev.desktop;
    
application/rss+xml=firefox_dev.desktop;
    
application/rdf+xml=firefox_dev.desktop;
    
image/gif=firefox_dev.desktop;org.gnome.gThumb.desktop;
    
video/webm=vlc.desktop;firefox_dev.desktop;
    
application/x-xpinstall=firefox_dev.desktop;
    
application/postscript=evince.desktop;inkscape.desktop;
    
image/x-eps=gimp.desktop;inkscape.desktop;
    
image/svg+xml=inkscape.desktop;org.gnome.gThumb.desktop;
    
image/bmp=org.gnome.gThumb.desktop;
    
image/tiff=org.gnome.gThumb.desktop;
    
image/x-bmp=org.gnome.gThumb.desktop;
    
image/x-ico=org.gnome.gThumb.desktop;
    
image/x-png=org.gnome.gThumb.desktop;
    
image/x-pcx=org.gnome.gThumb.desktop;
    
image/x-tga=org.gnome.gThumb.desktop;
    
image/xpm=org.gnome.gThumb.desktop;
    
audio/ogg=vlc.desktop;
    
audio/vorbis=vlc.desktop;
    
audio/x-vorbis=vlc.desktop;
    
audio/x-speex=vlc.desktop;
    
audio/opus=vlc.desktop;
    
audio/flac=vlc.desktop;
    
audio/x-flac=vlc.desktop;
    
audio/x-ms-asf=vlc.desktop;
    
audio/x-ms-asx=vlc.desktop;
    
audio/x-ms-wax=vlc.desktop;
    
audio/x-ms-wma=vlc.desktop;
    
audio/x-pn-windows-acm=vlc.desktop;
    
audio/vnd.rn-realaudio=vlc.desktop;
    
audio/x-pn-realaudio=vlc.desktop;
    
audio/x-pn-realaudio-plugin=vlc.desktop;
    
audio/x-real-audio=vlc.desktop;
    
audio/x-realaudio=vlc.desktop;
    
audio/mpeg=vlc.desktop;
    
audio/mpg=vlc.desktop;
    
audio/mp1=vlc.desktop;
    
audio/mp2=vlc.desktop;
    
audio/mp3=vlc.desktop;
    
audio/x-mp1=vlc.desktop;
    
audio/x-mp2=vlc.desktop;
    
audio/x-mp3=vlc.desktop;
    
audio/x-mpeg=vlc.desktop;
    
audio/x-mpg=vlc.desktop;
    
audio/aac=vlc.desktop;
    
audio/m4a=vlc.desktop;
    
audio/mp4=vlc.desktop;
    
audio/x-m4a=vlc.desktop;
    
audio/x-aac=vlc.desktop;
    
audio/x-matroska=vlc.desktop;
    
audio/webm=vlc.desktop;
    
audio/3gpp=vlc.desktop;
    
audio/3gpp2=vlc.desktop;
    
audio/AMR=vlc.desktop;
    
audio/AMR-WB=vlc.desktop;
    
audio/mpegurl=vlc.desktop;
    
audio/x-mpegurl=vlc.desktop;
    
audio/scpls=vlc.desktop;
    
audio/x-scpls=vlc.desktop;
    
audio/dv=vlc.desktop;
    
audio/x-aiff=vlc.desktop;
    
audio/x-pn-aiff=vlc.desktop;
    
audio/wav=vlc.desktop;
    
audio/x-pn-au=vlc.desktop;
    
audio/x-pn-wav=vlc.desktop;
    
audio/x-wav=vlc.desktop;
    
audio/x-adpcm=vlc.desktop;
    
audio/ac3=vlc.desktop;
    
audio/eac3=vlc.desktop;
    
audio/vnd.dts=vlc.desktop;
    
audio/vnd.dts.hd=vlc.desktop;
    
audio/vnd.dolby.heaac.1=vlc.desktop;
    
audio/vnd.dolby.heaac.2=vlc.desktop;
    
audio/vnd.dolby.mlp=vlc.desktop;
    
audio/basic=vlc.desktop;
    
audio/midi=vlc.desktop;
    
audio/x-ape=vlc.desktop;
    
audio/x-gsm=vlc.desktop;
    
audio/x-musepack=vlc.desktop;
    
audio/x-tta=vlc.desktop;
    
audio/x-wavpack=vlc.desktop;
    
audio/x-shorten=vlc.desktop;
    
audio/x-it=vlc.desktop;
    
audio/x-mod=vlc.desktop;
    
audio/x-s3m=vlc.desktop;
    
audio/x-xm=vlc.desktop;
    
application/x-desktop=atom.desktop;
    
application/x-sharedlib=atom.desktop;
    
application/x-executable=atom.desktop;


    Problem



    When I log in and then open FDE via its launcher, I'm asked whether I'd like to make FDE as default browser as it isn't currently the case. When I click on "Use FDE as my default browser", I got these lines appended to the [Default application] section of ~/.config/mimeapps.list:



    [...]
    
x-scheme-handler/http=userapp-Firefox Developer Edition-803SSZ.desktop
    
x-scheme-handler/https=userapp-Firefox Developer Edition-803SSZ.desktop
    
x-scheme-handler/ftp=userapp-Firefox Developer Edition-803SSZ.desktop
    
x-scheme-handler/chrome=userapp-Firefox Developer Edition-803SSZ.desktop
    
text/html=userapp-Firefox Developer Edition-803SSZ.desktop
    
application/x-extension-htm=userapp-Firefox Developer Edition-803SSZ.desktop
    
application/x-extension-html=userapp-Firefox Developer Edition-803SSZ.desktop
    
application/x-extension-shtml=userapp-Firefox Developer Edition-803SSZ.desktop
    
application/xhtml+xml=userapp-Firefox Developer Edition-803SSZ.desktop
    
application/x-extension-xhtml=userapp-Firefox Developer Edition-803SSZ.desktop
    
application/x-extension-xht=userapp-Firefox Developer Edition-803SSZ.desktop
    
[...]


    Moreover, the same new *.desktop is appended in [Added Associations]:



    [Added Associations]
    
x-scheme-handler/mailto=thunderbird.desktop
    
message/rfc822=thunderbird.desktop
    
image/jpeg=inkscape.desktop;gimp.desktop;firefox_dev.desktop;
    
text/css=atom.desktop;
    
application/x-subrip=atom.desktop;
    
image/png=gimp.desktop;inkscape.desktop;eog.desktop;firefox_dev.desktop;org.gnome.gThumb.desktop;
    
x-scheme-handler/http=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
    
x-scheme-handler/https=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
    
x-scheme-handler/ftp=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
    
x-scheme-handler/chrome=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
    
text/html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
    
application/x-extension-htm=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
    
application/x-extension-html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
    
application/x-extension-shtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
    
application/xhtml+xml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
    
application/x-extension-xhtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
    
application/x-extension-xht=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
    
[...]


    If I close FDE (or even re-log) and opens it again, it works fine.



    However, if I click on a hyperlink in Thunderbird, FDE opens, but asks again to set it as my default browser. ~/.config/mimeapps.list now becomes:



    [...]
    
x-scheme-handler/http=thunderbird.desktop
    
x-scheme-handler/https=thunderbird.desktop
    
x-scheme-handler/ftp=thunderbird.desktop
    
x-scheme-handler/chrome=thunderbird.desktop
    
text/html=thunderbird.desktop
    
application/x-extension-htm=thunderbird.desktop
    
application/x-extension-html=thunderbird.desktop
    
application/x-extension-shtml=thunderbird.desktop
    
application/xhtml+xml=thunderbird.desktop
    
application/x-extension-xhtml=thunderbird.desktop
    
application/x-extension-xht=thunderbird.desktop
    

    
[Added Associations]
    
x-scheme-handler/mailto=thunderbird.desktop
    
message/rfc822=thunderbird.desktop
    
image/jpeg=inkscape.desktop;gimp.desktop;firefox_dev.desktop;
    
text/css=atom.desktop;
    
application/x-subrip=atom.desktop;
    
image/png=gimp.desktop;inkscape.desktop;eog.desktop;firefox_dev.desktop;org.gnome.gThumb.desktop;
    
x-scheme-handler/http=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
    
x-scheme-handler/https=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
    
x-scheme-handler/ftp=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
    
x-scheme-handler/chrome=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
    
text/html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
    
application/x-extension-htm=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
    
application/x-extension-html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
    
application/x-extension-shtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
    
application/xhtml+xml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
    
application/x-extension-xhtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
    
application/x-extension-xht=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
    
[...]


    Obviously, if I close FDE and re-opens it via the desktop launcher, I'm asked again to set it as my default browser…



    Question



    ➥ How to definitively set up FDE as my default browser?



    (And, as a side question: "Why is even a userapp-Firefox Developer Edition-803SSZ.desktop created?")






    18.04 firefox launcher default-programs default-browser







    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      Disclaimer: I have read the other questions relative to my issue (1, 2, 3, 4, etc.). However, I still have trouble keeping FDE as my default web browser.




      Background



      I have successfully installed Firefox Developer Edition (FDE) in /opt/firefox_dev/. It runs well, is up-to-date (64.0b11 (64-bit) on aurora channel),…



      I have also created the file ~/.local/share/applications/firefox_dev.desktop, which content is:



      [Desktop Entry]
      
Name=Firefox Developer Ed
      
GenericName=Firefox Developer Ed
      
Exec=/opt/firefox_dev/firefox %u
      
Terminal=false
      
Icon=/opt/firefox_dev/browser/chrome/icons/default/default128.png
      
Type=Application
      
Categories=Application;Network;X-Developer;
      
Comment=Firefox Developer Ed Web Browser.
      
StartupWMClass=Firefox Developer Edition


      I have only a handful of mimeapps.list files — one of which I'm supposed to modify: ~/.config/mimeapps.list. Its content is:



      [Default Applications]
      
x-scheme-handler/mailto=thunderbird.desktop
      
message/rfc822=thunderbird.desktop
      
text/xml=firefox_dev.desktop
      
application/xml=firefox_dev.desktop
      
application/rss+xml=firefox_dev.desktop
      
application/rdf+xml=firefox_dev.desktop
      
image/gif=org.gnome.gThumb.desktop
      
image/jpeg=org.gnome.gThumb.desktop
      
image/png=org.gnome.gThumb.desktop
      
video/webm=firefox_dev.desktop
      
application/x-xpinstall=firefox_dev.desktop
      
image/bmp=org.gnome.gThumb.desktop
      
image/tiff=org.gnome.gThumb.desktop
      
image/x-bmp=org.gnome.gThumb.desktop
      
image/x-ico=org.gnome.gThumb.desktop
      
image/x-png=org.gnome.gThumb.desktop
      
image/x-pcx=org.gnome.gThumb.desktop
      
image/x-tga=org.gnome.gThumb.desktop
      
image/xpm=org.gnome.gThumb.desktop
      
image/svg+xml=org.gnome.gThumb.desktop
      
audio/x-vorbis+ogg=vlc.desktop
      
audio/ogg=vlc.desktop
      
audio/vorbis=vlc.desktop
      
audio/x-vorbis=vlc.desktop
      
audio/x-speex=vlc.desktop
      
audio/opus=vlc.desktop
      
audio/flac=vlc.desktop
      
audio/x-flac=vlc.desktop
      
audio/x-ms-asf=vlc.desktop
      
audio/x-ms-asx=vlc.desktop
      
audio/x-ms-wax=vlc.desktop
      
audio/x-ms-wma=vlc.desktop
      
audio/x-pn-windows-acm=vlc.desktop
      
audio/vnd.rn-realaudio=vlc.desktop
      
audio/x-pn-realaudio=vlc.desktop
      
audio/x-pn-realaudio-plugin=vlc.desktop
      
audio/x-real-audio=vlc.desktop
      
audio/x-realaudio=vlc.desktop
      
audio/mpeg=vlc.desktop
      
audio/mpg=vlc.desktop
      
audio/mp1=vlc.desktop
      
audio/mp2=vlc.desktop
      
audio/mp3=vlc.desktop
      
audio/x-mp1=vlc.desktop
      
audio/x-mp2=vlc.desktop
      
audio/x-mp3=vlc.desktop
      
audio/x-mpeg=vlc.desktop
      
audio/x-mpg=vlc.desktop
      
audio/aac=vlc.desktop
      
audio/m4a=vlc.desktop
      
audio/mp4=vlc.desktop
      
audio/x-m4a=vlc.desktop
      
audio/x-aac=vlc.desktop
      
audio/x-matroska=vlc.desktop
      
audio/webm=vlc.desktop
      
audio/3gpp=vlc.desktop
      
audio/3gpp2=vlc.desktop
      
audio/AMR=vlc.desktop
      
audio/AMR-WB=vlc.desktop
      
audio/mpegurl=vlc.desktop
      
audio/x-mpegurl=vlc.desktop
      
audio/scpls=vlc.desktop
      
audio/x-scpls=vlc.desktop
      
audio/dv=vlc.desktop
      
audio/x-aiff=vlc.desktop
      
audio/x-pn-aiff=vlc.desktop
      
audio/wav=vlc.desktop
      
audio/x-pn-au=vlc.desktop
      
audio/x-pn-wav=vlc.desktop
      
audio/x-wav=vlc.desktop
      
audio/x-adpcm=vlc.desktop
      
audio/ac3=vlc.desktop
      
audio/eac3=vlc.desktop
      
audio/vnd.dts=vlc.desktop
      
audio/vnd.dts.hd=vlc.desktop
      
audio/vnd.dolby.heaac.1=vlc.desktop
      
audio/vnd.dolby.heaac.2=vlc.desktop
      
audio/vnd.dolby.mlp=vlc.desktop
      
audio/basic=vlc.desktop
      
audio/midi=vlc.desktop
      
audio/x-ape=vlc.desktop
      
audio/x-gsm=vlc.desktop
      
audio/x-musepack=vlc.desktop
      
audio/x-tta=vlc.desktop
      
audio/x-wavpack=vlc.desktop
      
audio/x-shorten=vlc.desktop
      
audio/x-it=vlc.desktop
      
audio/x-mod=vlc.desktop
      
audio/x-s3m=vlc.desktop
      
audio/x-xm=vlc.desktop
      

      
[Added Associations]
      
x-scheme-handler/mailto=thunderbird.desktop
      
message/rfc822=thunderbird.desktop
      
image/jpeg=inkscape.desktop;gimp.desktop;firefox_dev.desktop;
      
text/css=atom.desktop;
      
application/x-subrip=atom.desktop;
      
image/png=gimp.desktop;inkscape.desktop;eog.desktop;firefox_dev.desktop;org.gnome.gThumb.desktop;
      
x-scheme-handler/http=firefox_dev.desktop;
      
x-scheme-handler/https=firefox_dev.desktop;
      
x-scheme-handler/ftp=firefox_dev.desktop;
      
x-scheme-handler/chrome=firefox_dev.desktop;
      
text/html=firefox_dev.desktop;
      
application/x-extension-htm=firefox_dev.desktop;
      
application/x-extension-html=firefox_dev.desktop;
      
application/x-extension-shtml=firefox_dev.desktop;
      
application/xhtml+xml=firefox_dev.desktop;
      
application/x-extension-xhtml=firefox_dev.desktop;
      
application/x-extension-xht=firefox_dev.desktop;
      
text/csv=atom.desktop;
      
application/pdf=pdfshuffler.desktop;inkscape.desktop;
      
text/xml=firefox_dev.desktop;
      
application/xml=firefox_dev.desktop;
      
application/rss+xml=firefox_dev.desktop;
      
application/rdf+xml=firefox_dev.desktop;
      
image/gif=firefox_dev.desktop;org.gnome.gThumb.desktop;
      
video/webm=vlc.desktop;firefox_dev.desktop;
      
application/x-xpinstall=firefox_dev.desktop;
      
application/postscript=evince.desktop;inkscape.desktop;
      
image/x-eps=gimp.desktop;inkscape.desktop;
      
image/svg+xml=inkscape.desktop;org.gnome.gThumb.desktop;
      
image/bmp=org.gnome.gThumb.desktop;
      
image/tiff=org.gnome.gThumb.desktop;
      
image/x-bmp=org.gnome.gThumb.desktop;
      
image/x-ico=org.gnome.gThumb.desktop;
      
image/x-png=org.gnome.gThumb.desktop;
      
image/x-pcx=org.gnome.gThumb.desktop;
      
image/x-tga=org.gnome.gThumb.desktop;
      
image/xpm=org.gnome.gThumb.desktop;
      
audio/ogg=vlc.desktop;
      
audio/vorbis=vlc.desktop;
      
audio/x-vorbis=vlc.desktop;
      
audio/x-speex=vlc.desktop;
      
audio/opus=vlc.desktop;
      
audio/flac=vlc.desktop;
      
audio/x-flac=vlc.desktop;
      
audio/x-ms-asf=vlc.desktop;
      
audio/x-ms-asx=vlc.desktop;
      
audio/x-ms-wax=vlc.desktop;
      
audio/x-ms-wma=vlc.desktop;
      
audio/x-pn-windows-acm=vlc.desktop;
      
audio/vnd.rn-realaudio=vlc.desktop;
      
audio/x-pn-realaudio=vlc.desktop;
      
audio/x-pn-realaudio-plugin=vlc.desktop;
      
audio/x-real-audio=vlc.desktop;
      
audio/x-realaudio=vlc.desktop;
      
audio/mpeg=vlc.desktop;
      
audio/mpg=vlc.desktop;
      
audio/mp1=vlc.desktop;
      
audio/mp2=vlc.desktop;
      
audio/mp3=vlc.desktop;
      
audio/x-mp1=vlc.desktop;
      
audio/x-mp2=vlc.desktop;
      
audio/x-mp3=vlc.desktop;
      
audio/x-mpeg=vlc.desktop;
      
audio/x-mpg=vlc.desktop;
      
audio/aac=vlc.desktop;
      
audio/m4a=vlc.desktop;
      
audio/mp4=vlc.desktop;
      
audio/x-m4a=vlc.desktop;
      
audio/x-aac=vlc.desktop;
      
audio/x-matroska=vlc.desktop;
      
audio/webm=vlc.desktop;
      
audio/3gpp=vlc.desktop;
      
audio/3gpp2=vlc.desktop;
      
audio/AMR=vlc.desktop;
      
audio/AMR-WB=vlc.desktop;
      
audio/mpegurl=vlc.desktop;
      
audio/x-mpegurl=vlc.desktop;
      
audio/scpls=vlc.desktop;
      
audio/x-scpls=vlc.desktop;
      
audio/dv=vlc.desktop;
      
audio/x-aiff=vlc.desktop;
      
audio/x-pn-aiff=vlc.desktop;
      
audio/wav=vlc.desktop;
      
audio/x-pn-au=vlc.desktop;
      
audio/x-pn-wav=vlc.desktop;
      
audio/x-wav=vlc.desktop;
      
audio/x-adpcm=vlc.desktop;
      
audio/ac3=vlc.desktop;
      
audio/eac3=vlc.desktop;
      
audio/vnd.dts=vlc.desktop;
      
audio/vnd.dts.hd=vlc.desktop;
      
audio/vnd.dolby.heaac.1=vlc.desktop;
      
audio/vnd.dolby.heaac.2=vlc.desktop;
      
audio/vnd.dolby.mlp=vlc.desktop;
      
audio/basic=vlc.desktop;
      
audio/midi=vlc.desktop;
      
audio/x-ape=vlc.desktop;
      
audio/x-gsm=vlc.desktop;
      
audio/x-musepack=vlc.desktop;
      
audio/x-tta=vlc.desktop;
      
audio/x-wavpack=vlc.desktop;
      
audio/x-shorten=vlc.desktop;
      
audio/x-it=vlc.desktop;
      
audio/x-mod=vlc.desktop;
      
audio/x-s3m=vlc.desktop;
      
audio/x-xm=vlc.desktop;
      
application/x-desktop=atom.desktop;
      
application/x-sharedlib=atom.desktop;
      
application/x-executable=atom.desktop;


      Problem



      When I log in and then open FDE via its launcher, I'm asked whether I'd like to make FDE as default browser as it isn't currently the case. When I click on "Use FDE as my default browser", I got these lines appended to the [Default application] section of ~/.config/mimeapps.list:



      [...]
      
x-scheme-handler/http=userapp-Firefox Developer Edition-803SSZ.desktop
      
x-scheme-handler/https=userapp-Firefox Developer Edition-803SSZ.desktop
      
x-scheme-handler/ftp=userapp-Firefox Developer Edition-803SSZ.desktop
      
x-scheme-handler/chrome=userapp-Firefox Developer Edition-803SSZ.desktop
      
text/html=userapp-Firefox Developer Edition-803SSZ.desktop
      
application/x-extension-htm=userapp-Firefox Developer Edition-803SSZ.desktop
      
application/x-extension-html=userapp-Firefox Developer Edition-803SSZ.desktop
      
application/x-extension-shtml=userapp-Firefox Developer Edition-803SSZ.desktop
      
application/xhtml+xml=userapp-Firefox Developer Edition-803SSZ.desktop
      
application/x-extension-xhtml=userapp-Firefox Developer Edition-803SSZ.desktop
      
application/x-extension-xht=userapp-Firefox Developer Edition-803SSZ.desktop
      
[...]


      Moreover, the same new *.desktop is appended in [Added Associations]:



      [Added Associations]
      
x-scheme-handler/mailto=thunderbird.desktop
      
message/rfc822=thunderbird.desktop
      
image/jpeg=inkscape.desktop;gimp.desktop;firefox_dev.desktop;
      
text/css=atom.desktop;
      
application/x-subrip=atom.desktop;
      
image/png=gimp.desktop;inkscape.desktop;eog.desktop;firefox_dev.desktop;org.gnome.gThumb.desktop;
      
x-scheme-handler/http=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
x-scheme-handler/https=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
x-scheme-handler/ftp=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
x-scheme-handler/chrome=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
text/html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
application/x-extension-htm=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
application/x-extension-html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
application/x-extension-shtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
application/xhtml+xml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
application/x-extension-xhtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
application/x-extension-xht=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
[...]


      If I close FDE (or even re-log) and opens it again, it works fine.



      However, if I click on a hyperlink in Thunderbird, FDE opens, but asks again to set it as my default browser. ~/.config/mimeapps.list now becomes:



      [...]
      
x-scheme-handler/http=thunderbird.desktop
      
x-scheme-handler/https=thunderbird.desktop
      
x-scheme-handler/ftp=thunderbird.desktop
      
x-scheme-handler/chrome=thunderbird.desktop
      
text/html=thunderbird.desktop
      
application/x-extension-htm=thunderbird.desktop
      
application/x-extension-html=thunderbird.desktop
      
application/x-extension-shtml=thunderbird.desktop
      
application/xhtml+xml=thunderbird.desktop
      
application/x-extension-xhtml=thunderbird.desktop
      
application/x-extension-xht=thunderbird.desktop
      

      
[Added Associations]
      
x-scheme-handler/mailto=thunderbird.desktop
      
message/rfc822=thunderbird.desktop
      
image/jpeg=inkscape.desktop;gimp.desktop;firefox_dev.desktop;
      
text/css=atom.desktop;
      
application/x-subrip=atom.desktop;
      
image/png=gimp.desktop;inkscape.desktop;eog.desktop;firefox_dev.desktop;org.gnome.gThumb.desktop;
      
x-scheme-handler/http=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
x-scheme-handler/https=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
x-scheme-handler/ftp=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
x-scheme-handler/chrome=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
text/html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
application/x-extension-htm=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
application/x-extension-html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
application/x-extension-shtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
application/xhtml+xml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
application/x-extension-xhtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
application/x-extension-xht=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
[...]


      Obviously, if I close FDE and re-opens it via the desktop launcher, I'm asked again to set it as my default browser…



      Question



      ➥ How to definitively set up FDE as my default browser?



      (And, as a side question: "Why is even a userapp-Firefox Developer Edition-803SSZ.desktop created?")






      18.04 firefox launcher default-programs default-browser







      share|improve this question













      Disclaimer: I have read the other questions relative to my issue (1, 2, 3, 4, etc.). However, I still have trouble keeping FDE as my default web browser.




      Background



      I have successfully installed Firefox Developer Edition (FDE) in /opt/firefox_dev/. It runs well, is up-to-date (64.0b11 (64-bit) on aurora channel),…



      I have also created the file ~/.local/share/applications/firefox_dev.desktop, which content is:



      [Desktop Entry]
      
Name=Firefox Developer Ed
      
GenericName=Firefox Developer Ed
      
Exec=/opt/firefox_dev/firefox %u
      
Terminal=false
      
Icon=/opt/firefox_dev/browser/chrome/icons/default/default128.png
      
Type=Application
      
Categories=Application;Network;X-Developer;
      
Comment=Firefox Developer Ed Web Browser.
      
StartupWMClass=Firefox Developer Edition


      I have only a handful of mimeapps.list files — one of which I'm supposed to modify: ~/.config/mimeapps.list. Its content is:



      [Default Applications]
      
x-scheme-handler/mailto=thunderbird.desktop
      
message/rfc822=thunderbird.desktop
      
text/xml=firefox_dev.desktop
      
application/xml=firefox_dev.desktop
      
application/rss+xml=firefox_dev.desktop
      
application/rdf+xml=firefox_dev.desktop
      
image/gif=org.gnome.gThumb.desktop
      
image/jpeg=org.gnome.gThumb.desktop
      
image/png=org.gnome.gThumb.desktop
      
video/webm=firefox_dev.desktop
      
application/x-xpinstall=firefox_dev.desktop
      
image/bmp=org.gnome.gThumb.desktop
      
image/tiff=org.gnome.gThumb.desktop
      
image/x-bmp=org.gnome.gThumb.desktop
      
image/x-ico=org.gnome.gThumb.desktop
      
image/x-png=org.gnome.gThumb.desktop
      
image/x-pcx=org.gnome.gThumb.desktop
      
image/x-tga=org.gnome.gThumb.desktop
      
image/xpm=org.gnome.gThumb.desktop
      
image/svg+xml=org.gnome.gThumb.desktop
      
audio/x-vorbis+ogg=vlc.desktop
      
audio/ogg=vlc.desktop
      
audio/vorbis=vlc.desktop
      
audio/x-vorbis=vlc.desktop
      
audio/x-speex=vlc.desktop
      
audio/opus=vlc.desktop
      
audio/flac=vlc.desktop
      
audio/x-flac=vlc.desktop
      
audio/x-ms-asf=vlc.desktop
      
audio/x-ms-asx=vlc.desktop
      
audio/x-ms-wax=vlc.desktop
      
audio/x-ms-wma=vlc.desktop
      
audio/x-pn-windows-acm=vlc.desktop
      
audio/vnd.rn-realaudio=vlc.desktop
      
audio/x-pn-realaudio=vlc.desktop
      
audio/x-pn-realaudio-plugin=vlc.desktop
      
audio/x-real-audio=vlc.desktop
      
audio/x-realaudio=vlc.desktop
      
audio/mpeg=vlc.desktop
      
audio/mpg=vlc.desktop
      
audio/mp1=vlc.desktop
      
audio/mp2=vlc.desktop
      
audio/mp3=vlc.desktop
      
audio/x-mp1=vlc.desktop
      
audio/x-mp2=vlc.desktop
      
audio/x-mp3=vlc.desktop
      
audio/x-mpeg=vlc.desktop
      
audio/x-mpg=vlc.desktop
      
audio/aac=vlc.desktop
      
audio/m4a=vlc.desktop
      
audio/mp4=vlc.desktop
      
audio/x-m4a=vlc.desktop
      
audio/x-aac=vlc.desktop
      
audio/x-matroska=vlc.desktop
      
audio/webm=vlc.desktop
      
audio/3gpp=vlc.desktop
      
audio/3gpp2=vlc.desktop
      
audio/AMR=vlc.desktop
      
audio/AMR-WB=vlc.desktop
      
audio/mpegurl=vlc.desktop
      
audio/x-mpegurl=vlc.desktop
      
audio/scpls=vlc.desktop
      
audio/x-scpls=vlc.desktop
      
audio/dv=vlc.desktop
      
audio/x-aiff=vlc.desktop
      
audio/x-pn-aiff=vlc.desktop
      
audio/wav=vlc.desktop
      
audio/x-pn-au=vlc.desktop
      
audio/x-pn-wav=vlc.desktop
      
audio/x-wav=vlc.desktop
      
audio/x-adpcm=vlc.desktop
      
audio/ac3=vlc.desktop
      
audio/eac3=vlc.desktop
      
audio/vnd.dts=vlc.desktop
      
audio/vnd.dts.hd=vlc.desktop
      
audio/vnd.dolby.heaac.1=vlc.desktop
      
audio/vnd.dolby.heaac.2=vlc.desktop
      
audio/vnd.dolby.mlp=vlc.desktop
      
audio/basic=vlc.desktop
      
audio/midi=vlc.desktop
      
audio/x-ape=vlc.desktop
      
audio/x-gsm=vlc.desktop
      
audio/x-musepack=vlc.desktop
      
audio/x-tta=vlc.desktop
      
audio/x-wavpack=vlc.desktop
      
audio/x-shorten=vlc.desktop
      
audio/x-it=vlc.desktop
      
audio/x-mod=vlc.desktop
      
audio/x-s3m=vlc.desktop
      
audio/x-xm=vlc.desktop
      

      
[Added Associations]
      
x-scheme-handler/mailto=thunderbird.desktop
      
message/rfc822=thunderbird.desktop
      
image/jpeg=inkscape.desktop;gimp.desktop;firefox_dev.desktop;
      
text/css=atom.desktop;
      
application/x-subrip=atom.desktop;
      
image/png=gimp.desktop;inkscape.desktop;eog.desktop;firefox_dev.desktop;org.gnome.gThumb.desktop;
      
x-scheme-handler/http=firefox_dev.desktop;
      
x-scheme-handler/https=firefox_dev.desktop;
      
x-scheme-handler/ftp=firefox_dev.desktop;
      
x-scheme-handler/chrome=firefox_dev.desktop;
      
text/html=firefox_dev.desktop;
      
application/x-extension-htm=firefox_dev.desktop;
      
application/x-extension-html=firefox_dev.desktop;
      
application/x-extension-shtml=firefox_dev.desktop;
      
application/xhtml+xml=firefox_dev.desktop;
      
application/x-extension-xhtml=firefox_dev.desktop;
      
application/x-extension-xht=firefox_dev.desktop;
      
text/csv=atom.desktop;
      
application/pdf=pdfshuffler.desktop;inkscape.desktop;
      
text/xml=firefox_dev.desktop;
      
application/xml=firefox_dev.desktop;
      
application/rss+xml=firefox_dev.desktop;
      
application/rdf+xml=firefox_dev.desktop;
      
image/gif=firefox_dev.desktop;org.gnome.gThumb.desktop;
      
video/webm=vlc.desktop;firefox_dev.desktop;
      
application/x-xpinstall=firefox_dev.desktop;
      
application/postscript=evince.desktop;inkscape.desktop;
      
image/x-eps=gimp.desktop;inkscape.desktop;
      
image/svg+xml=inkscape.desktop;org.gnome.gThumb.desktop;
      
image/bmp=org.gnome.gThumb.desktop;
      
image/tiff=org.gnome.gThumb.desktop;
      
image/x-bmp=org.gnome.gThumb.desktop;
      
image/x-ico=org.gnome.gThumb.desktop;
      
image/x-png=org.gnome.gThumb.desktop;
      
image/x-pcx=org.gnome.gThumb.desktop;
      
image/x-tga=org.gnome.gThumb.desktop;
      
image/xpm=org.gnome.gThumb.desktop;
      
audio/ogg=vlc.desktop;
      
audio/vorbis=vlc.desktop;
      
audio/x-vorbis=vlc.desktop;
      
audio/x-speex=vlc.desktop;
      
audio/opus=vlc.desktop;
      
audio/flac=vlc.desktop;
      
audio/x-flac=vlc.desktop;
      
audio/x-ms-asf=vlc.desktop;
      
audio/x-ms-asx=vlc.desktop;
      
audio/x-ms-wax=vlc.desktop;
      
audio/x-ms-wma=vlc.desktop;
      
audio/x-pn-windows-acm=vlc.desktop;
      
audio/vnd.rn-realaudio=vlc.desktop;
      
audio/x-pn-realaudio=vlc.desktop;
      
audio/x-pn-realaudio-plugin=vlc.desktop;
      
audio/x-real-audio=vlc.desktop;
      
audio/x-realaudio=vlc.desktop;
      
audio/mpeg=vlc.desktop;
      
audio/mpg=vlc.desktop;
      
audio/mp1=vlc.desktop;
      
audio/mp2=vlc.desktop;
      
audio/mp3=vlc.desktop;
      
audio/x-mp1=vlc.desktop;
      
audio/x-mp2=vlc.desktop;
      
audio/x-mp3=vlc.desktop;
      
audio/x-mpeg=vlc.desktop;
      
audio/x-mpg=vlc.desktop;
      
audio/aac=vlc.desktop;
      
audio/m4a=vlc.desktop;
      
audio/mp4=vlc.desktop;
      
audio/x-m4a=vlc.desktop;
      
audio/x-aac=vlc.desktop;
      
audio/x-matroska=vlc.desktop;
      
audio/webm=vlc.desktop;
      
audio/3gpp=vlc.desktop;
      
audio/3gpp2=vlc.desktop;
      
audio/AMR=vlc.desktop;
      
audio/AMR-WB=vlc.desktop;
      
audio/mpegurl=vlc.desktop;
      
audio/x-mpegurl=vlc.desktop;
      
audio/scpls=vlc.desktop;
      
audio/x-scpls=vlc.desktop;
      
audio/dv=vlc.desktop;
      
audio/x-aiff=vlc.desktop;
      
audio/x-pn-aiff=vlc.desktop;
      
audio/wav=vlc.desktop;
      
audio/x-pn-au=vlc.desktop;
      
audio/x-pn-wav=vlc.desktop;
      
audio/x-wav=vlc.desktop;
      
audio/x-adpcm=vlc.desktop;
      
audio/ac3=vlc.desktop;
      
audio/eac3=vlc.desktop;
      
audio/vnd.dts=vlc.desktop;
      
audio/vnd.dts.hd=vlc.desktop;
      
audio/vnd.dolby.heaac.1=vlc.desktop;
      
audio/vnd.dolby.heaac.2=vlc.desktop;
      
audio/vnd.dolby.mlp=vlc.desktop;
      
audio/basic=vlc.desktop;
      
audio/midi=vlc.desktop;
      
audio/x-ape=vlc.desktop;
      
audio/x-gsm=vlc.desktop;
      
audio/x-musepack=vlc.desktop;
      
audio/x-tta=vlc.desktop;
      
audio/x-wavpack=vlc.desktop;
      
audio/x-shorten=vlc.desktop;
      
audio/x-it=vlc.desktop;
      
audio/x-mod=vlc.desktop;
      
audio/x-s3m=vlc.desktop;
      
audio/x-xm=vlc.desktop;
      
application/x-desktop=atom.desktop;
      
application/x-sharedlib=atom.desktop;
      
application/x-executable=atom.desktop;


      Problem



      When I log in and then open FDE via its launcher, I'm asked whether I'd like to make FDE as default browser as it isn't currently the case. When I click on "Use FDE as my default browser", I got these lines appended to the [Default application] section of ~/.config/mimeapps.list:



      [...]
      
x-scheme-handler/http=userapp-Firefox Developer Edition-803SSZ.desktop
      
x-scheme-handler/https=userapp-Firefox Developer Edition-803SSZ.desktop
      
x-scheme-handler/ftp=userapp-Firefox Developer Edition-803SSZ.desktop
      
x-scheme-handler/chrome=userapp-Firefox Developer Edition-803SSZ.desktop
      
text/html=userapp-Firefox Developer Edition-803SSZ.desktop
      
application/x-extension-htm=userapp-Firefox Developer Edition-803SSZ.desktop
      
application/x-extension-html=userapp-Firefox Developer Edition-803SSZ.desktop
      
application/x-extension-shtml=userapp-Firefox Developer Edition-803SSZ.desktop
      
application/xhtml+xml=userapp-Firefox Developer Edition-803SSZ.desktop
      
application/x-extension-xhtml=userapp-Firefox Developer Edition-803SSZ.desktop
      
application/x-extension-xht=userapp-Firefox Developer Edition-803SSZ.desktop
      
[...]


      Moreover, the same new *.desktop is appended in [Added Associations]:



      [Added Associations]
      
x-scheme-handler/mailto=thunderbird.desktop
      
message/rfc822=thunderbird.desktop
      
image/jpeg=inkscape.desktop;gimp.desktop;firefox_dev.desktop;
      
text/css=atom.desktop;
      
application/x-subrip=atom.desktop;
      
image/png=gimp.desktop;inkscape.desktop;eog.desktop;firefox_dev.desktop;org.gnome.gThumb.desktop;
      
x-scheme-handler/http=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
x-scheme-handler/https=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
x-scheme-handler/ftp=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
x-scheme-handler/chrome=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
text/html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
application/x-extension-htm=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
application/x-extension-html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
application/x-extension-shtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
application/xhtml+xml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
application/x-extension-xhtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
application/x-extension-xht=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;
      
[...]


      If I close FDE (or even re-log) and opens it again, it works fine.



      However, if I click on a hyperlink in Thunderbird, FDE opens, but asks again to set it as my default browser. ~/.config/mimeapps.list now becomes:



      [...]
      
x-scheme-handler/http=thunderbird.desktop
      
x-scheme-handler/https=thunderbird.desktop
      
x-scheme-handler/ftp=thunderbird.desktop
      
x-scheme-handler/chrome=thunderbird.desktop
      
text/html=thunderbird.desktop
      
application/x-extension-htm=thunderbird.desktop
      
application/x-extension-html=thunderbird.desktop
      
application/x-extension-shtml=thunderbird.desktop
      
application/xhtml+xml=thunderbird.desktop
      
application/x-extension-xhtml=thunderbird.desktop
      
application/x-extension-xht=thunderbird.desktop
      

      
[Added Associations]
      
x-scheme-handler/mailto=thunderbird.desktop
      
message/rfc822=thunderbird.desktop
      
image/jpeg=inkscape.desktop;gimp.desktop;firefox_dev.desktop;
      
text/css=atom.desktop;
      
application/x-subrip=atom.desktop;
      
image/png=gimp.desktop;inkscape.desktop;eog.desktop;firefox_dev.desktop;org.gnome.gThumb.desktop;
      
x-scheme-handler/http=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
x-scheme-handler/https=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
x-scheme-handler/ftp=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
x-scheme-handler/chrome=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
text/html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
application/x-extension-htm=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
application/x-extension-html=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
application/x-extension-shtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
application/xhtml+xml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
application/x-extension-xhtml=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
application/x-extension-xht=firefox_dev.desktop;userapp-Firefox Developer Edition-803SSZ.desktop;thunderbird.desktop;
      
[...]


      Obviously, if I close FDE and re-opens it via the desktop launcher, I'm asked again to set it as my default browser…



      Question



      ➥ How to definitively set up FDE as my default browser?



      (And, as a side question: "Why is even a userapp-Firefox Developer Edition-803SSZ.desktop created?")






      18.04 firefox launcher default-programs default-browser




      18.04 firefox launcher default-programs default-browser






      share|improve this question













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      asked Nov 20 at 19:13









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