made a backup of mimeapps.list and re-created a new one . still the same
problem .
is it a gnome bug ? a thunderbird bug ? a firefox bug ?
cat mimeapps.list.bak
[Default Applications]
x-scheme-handler/http=firefox.desktop
x-scheme-handler/https=firefox.desktop
x-scheme-handler/mailto=thunderbird.desktop
text/calendar=thunderbird.desktop
image/jpeg=shotwell-viewer.desktop
image/jpg=shotwell-viewer.desktop
image/pjpeg=shotwell-viewer.desktop
image/png=shotwell-viewer.desktop
image/tiff=shotwell-viewer.desktop
image/x-3fr=shotwell-viewer.desktop
image/x-adobe-dng=shotwell-viewer.desktop
image/x-arw=shotwell-viewer.desktop
image/x-bay=shotwell-viewer.desktop
image/x-bmp=shotwell-viewer.desktop
image/x-canon-cr2=shotwell-viewer.desktop
image/x-canon-crw=shotwell-viewer.desktop
image/x-cap=shotwell-viewer.desktop
image/x-cr2=shotwell-viewer.desktop
image/x-crw=shotwell-viewer.desktop
image/x-dcr=shotwell-viewer.desktop
image/x-dcraw=shotwell-viewer.desktop
image/x-dcs=shotwell-viewer.desktop
image/x-dng=shotwell-viewer.desktop
image/x-drf=shotwell-viewer.desktop
image/x-eip=shotwell-viewer.desktop
image/x-erf=shotwell-viewer.desktop
image/x-fff=shotwell-viewer.desktop
image/x-fuji-raf=shotwell-viewer.desktop
image/x-iiq=shotwell-viewer.desktop
image/x-k25=shotwell-viewer.desktop
image/x-kdc=shotwell-viewer.desktop
image/x-mef=shotwell-viewer.desktop
image/x-minolta-mrw=shotwell-viewer.desktop
image/x-mos=shotwell-viewer.desktop
image/x-mrw=shotwell-viewer.desktop
image/x-nef=shotwell-viewer.desktop
image/x-nikon-nef=shotwell-viewer.desktop
image/x-nrw=shotwell-viewer.desktop
image/x-olympus-orf=shotwell-viewer.desktop
image/x-orf=shotwell-viewer.desktop
image/x-panasonic-raw=shotwell-viewer.desktop
image/x-pef=shotwell-viewer.desktop
image/x-pentax-pef=shotwell-viewer.desktop
image/x-png=shotwell-viewer.desktop
image/x-ptx=shotwell-viewer.desktop
image/x-pxn=shotwell-viewer.desktop
image/x-r3d=shotwell-viewer.desktop
image/x-raf=shotwell-viewer.desktop
image/x-raw=shotwell-viewer.desktop
image/x-rw2=shotwell-viewer.desktop
image/x-rwl=shotwell-viewer.desktop
image/x-rwz=shotwell-viewer.desktop
image/x-sigma-x3f=shotwell-viewer.desktop
image/x-sony-arw=shotwell-viewer.desktop
image/x-sony-sr2=shotwell-viewer.desktop
image/x-sony-srf=shotwell-viewer.desktop
image/x-sr2=shotwell-viewer.desktop
image/x-srf=shotwell-viewer.desktop
image/x-x3f=shotwell-viewer.desktop
x-scheme-handler/discord-424004941485572097=discord-424004941485572097.desktop
x-scheme-handler/chrome=firefox.desktop
application/x-extension-htm=firefox.desktop
application/x-extension-html=firefox.desktop
application/x-extension-shtml=firefox.desktop
application/xhtml+xml=firefox.desktop
application/x-extension-xhtml=firefox.desktop
application/x-extension-xht=firefox.desktop
x-scheme-handler/ftp=firefox-esr.desktop
video/x-ogm+ogg=vlc.desktop
video/ogg=vlc.desktop
video/x-ogm=vlc.desktop
video/x-theora+ogg=vlc.desktop
video/x-theora=vlc.desktop
video/x-ms-asf=vlc.desktop
video/x-ms-asf-plugin=vlc.desktop
video/x-ms-asx=vlc.desktop
video/x-ms-wm=vlc.desktop
video/x-ms-wmv=vlc.desktop
video/x-ms-wmx=vlc.desktop
video/x-ms-wvx=vlc.desktop
video/x-msvideo=vlc.desktop
video/divx=vlc.desktop
video/msvideo=vlc.desktop
video/vnd.divx=vlc.desktop
video/avi=vlc.desktop
video/x-avi=vlc.desktop
video/vnd.rn-realvideo=vlc.desktop
video/mp2t=vlc.desktop
video/mpeg=vlc.desktop
video/mpeg-system=vlc.desktop
video/x-mpeg=vlc.desktop
video/x-mpeg2=vlc.desktop
video/x-mpeg-system=vlc.desktop
video/mp4=vlc.desktop
video/mp4v-es=vlc.desktop
video/x-m4v=vlc.desktop
video/quicktime=vlc.desktop
video/x-matroska=vlc.desktop
video/webm=vlc.desktop
video/3gp=vlc.desktop
video/3gpp=vlc.desktop
video/3gpp2=vlc.desktop
video/vnd.mpegurl=vlc.desktop
video/dv=vlc.desktop
video/x-anim=vlc.desktop
video/x-nsv=vlc.desktop
video/fli=vlc.desktop
video/flv=vlc.desktop
video/x-flc=vlc.desktop
video/x-fli=vlc.desktop
video/x-flv=vlc.desktop
audio/x-vorbis+ogg=rhythmbox.desktop
audio/vorbis=rhythmbox.desktop
audio/x-vorbis=rhythmbox.desktop
audio/x-scpls=rhythmbox.desktop
audio/x-mp3=rhythmbox.desktop
audio/x-mpeg=rhythmbox.desktop
audio/mpeg=rhythmbox.desktop
audio/x-mpegurl=rhythmbox.desktop
audio/x-flac=rhythmbox.desktop
audio/mp4=rhythmbox.desktop
audio/x-it=rhythmbox.desktop
audio/x-mod=rhythmbox.desktop
audio/x-s3m=rhythmbox.desktop
audio/x-stm=rhythmbox.desktop
audio/x-xm=rhythmbox.desktop
text/html=firefox.desktop
[Added Associations]
x-scheme-handler/http=chromium.desktop;firefox.desktop;thunderbird.desktop;firefox-esr.desktop;
x-scheme-handler/https=chromium.desktop;firefox.desktop;thunderbird.desktop;firefox-esr.desktop;
x-scheme-handler/mailto=thunderbird.desktop;
text/calendar=thunderbird.desktop;
application/vnd.debian.binary-package=gdebi.desktop;
video/mp4=mediainfo-gui.desktop;vlc.desktop;
application/x-cd-image=gnome-disk-image-mounter.desktop;
application/x-wine-extension-inf=mousepad.desktop;
application/x-desktop=mousepad.desktop;
application/octet-stream=mousepad.desktop;
image/jpg=shotwell-viewer.desktop;
image/pjpeg=shotwell-viewer.desktop;
image/png=gimp.desktop;shotwell-viewer.desktop;
image/tiff=shotwell-viewer.desktop;
image/x-3fr=shotwell-viewer.desktop;
image/x-adobe-dng=shotwell-viewer.desktop;
image/x-arw=shotwell-viewer.desktop;
image/x-bay=shotwell-viewer.desktop;
image/x-bmp=shotwell-viewer.desktop;
image/x-canon-cr2=shotwell-viewer.desktop;
image/x-canon-crw=shotwell-viewer.desktop;
image/x-cap=shotwell-viewer.desktop;
image/x-cr2=shotwell-viewer.desktop;
image/x-crw=shotwell-viewer.desktop;
image/x-dcr=shotwell-viewer.desktop;
image/x-dcraw=shotwell-viewer.desktop;
image/x-dcs=shotwell-viewer.desktop;
image/x-dng=shotwell-viewer.desktop;
image/x-drf=shotwell-viewer.desktop;
image/x-eip=shotwell-viewer.desktop;
image/x-erf=shotwell-viewer.desktop;
image/x-fff=shotwell-viewer.desktop;
image/x-fuji-raf=shotwell-viewer.desktop;
image/x-iiq=shotwell-viewer.desktop;
image/x-k25=shotwell-viewer.desktop;
image/x-kdc=shotwell-viewer.desktop;
image/x-mef=shotwell-viewer.desktop;
image/x-minolta-mrw=shotwell-viewer.desktop;
image/x-mos=shotwell-viewer.desktop;
image/x-mrw=shotwell-viewer.desktop;
image/x-nef=shotwell-viewer.desktop;
image/x-nikon-nef=shotwell-viewer.desktop;
image/x-nrw=shotwell-viewer.desktop;
image/x-olympus-orf=shotwell-viewer.desktop;
image/x-orf=shotwell-viewer.desktop;
image/x-panasonic-raw=shotwell-viewer.desktop;
image/x-pef=shotwell-viewer.desktop;
image/x-pentax-pef=shotwell-viewer.desktop;
image/x-png=shotwell-viewer.desktop;
image/x-ptx=shotwell-viewer.desktop;
image/x-pxn=shotwell-viewer.desktop;
image/x-r3d=shotwell-viewer.desktop;
image/x-raf=shotwell-viewer.desktop;
image/x-raw=shotwell-viewer.desktop;
image/x-rw2=shotwell-viewer.desktop;
image/x-rwl=shotwell-viewer.desktop;
image/x-rwz=shotwell-viewer.desktop;
image/x-sigma-x3f=shotwell-viewer.desktop;
image/x-sony-arw=shotwell-viewer.desktop;
image/x-sony-sr2=shotwell-viewer.desktop;
image/x-sony-srf=shotwell-viewer.desktop;
image/x-sr2=shotwell-viewer.desktop;
image/x-srf=shotwell-viewer.desktop;
image/x-x3f=shotwell-viewer.desktop;
application/x-ms-dos-executable=wine-extension-vbs.desktop;net.lutris.Lutris.desktop;
x-scheme-handler/chrome=firefox.desktop;firefox-esr.desktop;
application/x-extension-htm=firefox.desktop;firefox-esr.desktop;
application/x-extension-html=firefox.desktop;firefox-esr.desktop;
application/x-extension-shtml=firefox.desktop;firefox-esr.desktop;
application/xhtml+xml=firefox.desktop;thunderbird.desktop;firefox-esr.desktop;
application/x-extension-xhtml=firefox.desktop;firefox-esr.desktop;
application/x-extension-xht=firefox.desktop;firefox-esr.desktop;
image/jpeg=gimp.desktop;mediainfo-gui.desktop;darktable.desktop;
application/x-keepass2=org.keepassxc.KeePassXC.desktop;
application/vnd.tcpdump.pcap=wireshark.desktop;
video/ogg=vlc.desktop;
video/x-ogm=vlc.desktop;
video/x-theora+ogg=vlc.desktop;
video/x-theora=vlc.desktop;
video/x-ms-asf=vlc.desktop;
video/x-ms-asf-plugin=vlc.desktop;
video/x-ms-asx=vlc.desktop;
video/x-ms-wm=vlc.desktop;
video/x-ms-wmv=vlc.desktop;
video/x-ms-wmx=vlc.desktop;
video/x-ms-wvx=vlc.desktop;
video/x-msvideo=vlc.desktop;
video/divx=vlc.desktop;
video/msvideo=vlc.desktop;
video/vnd.divx=vlc.desktop;
video/avi=vlc.desktop;
video/x-avi=vlc.desktop;
video/vnd.rn-realvideo=vlc.desktop;
video/mp2t=vlc.desktop;
video/mpeg=vlc.desktop;
video/mpeg-system=vlc.desktop;
video/x-mpeg=vlc.desktop;
video/x-mpeg2=vlc.desktop;
video/x-mpeg-system=vlc.desktop;
video/mp4v-es=vlc.desktop;
video/x-m4v=vlc.desktop;
video/quicktime=vlc.desktop;
video/x-matroska=mediainfo-gui.desktop;vlc.desktop;
video/webm=vlc.desktop;
video/3gp=vlc.desktop;
video/3gpp=vlc.desktop;
video/3gpp2=vlc.desktop;
video/vnd.mpegurl=vlc.desktop;
video/dv=vlc.desktop;
video/x-anim=vlc.desktop;
video/x-nsv=vlc.desktop;
video/fli=vlc.desktop;
video/flv=vlc.desktop;
video/x-flc=vlc.desktop;
video/x-fli=vlc.desktop;
video/x-flv=vlc.desktop;
audio/vorbis=rhythmbox.desktop;
audio/x-vorbis=rhythmbox.desktop;
audio/x-scpls=rhythmbox.desktop;
audio/x-mp3=rhythmbox.desktop;
audio/x-mpeg=rhythmbox.desktop;
audio/mpeg=rhythmbox.desktop;
audio/x-mpegurl=rhythmbox.desktop;
audio/x-flac=rhythmbox.desktop;
audio/mp4=rhythmbox.desktop;
audio/x-it=rhythmbox.desktop;
audio/x-mod=rhythmbox.desktop;
audio/x-s3m=rhythmbox.desktop;
audio/x-stm=rhythmbox.desktop;
audio/x-xm=rhythmbox.desktop;
text/html=firefox.desktop;thunderbird.desktop;firefox-esr.desktop;chromium.desktop;
application/x-mozilla-bookmarks=firefox.desktop;
video/x-sgi-movie=winff.desktop;
cat mimeapps.list
[Default Applications]
x-scheme-handler/http=firefox.desktop
text/html=firefox.desktop
application/xhtml+xml=firefox.desktop
x-scheme-handler/https=firefox.desktop
x-scheme-handler/mailto=thunderbird.desktop
text/calendar=thunderbird.desktop
audio/x-vorbis+ogg=rhythmbox.desktop
audio/vorbis=rhythmbox.desktop
audio/x-vorbis=rhythmbox.desktop
audio/x-scpls=rhythmbox.desktop
audio/x-mp3=rhythmbox.desktop
audio/x-mpeg=rhythmbox.desktop
audio/mpeg=rhythmbox.desktop
audio/x-mpegurl=rhythmbox.desktop
audio/x-flac=rhythmbox.desktop
audio/mp4=rhythmbox.desktop
audio/x-it=rhythmbox.desktop
audio/x-mod=rhythmbox.desktop
audio/x-s3m=rhythmbox.desktop
audio/x-stm=rhythmbox.desktop
audio/x-xm=rhythmbox.desktop
video/x-ogm+ogg=vlc.desktop
video/ogg=vlc.desktop
video/x-ogm=vlc.desktop
video/x-theora+ogg=vlc.desktop
video/x-theora=vlc.desktop
video/x-ms-asf=vlc.desktop
video/x-ms-asf-plugin=vlc.desktop
video/x-ms-asx=vlc.desktop
video/x-ms-wm=vlc.desktop
video/x-ms-wmv=vlc.desktop
video/x-ms-wmx=vlc.desktop
video/x-ms-wvx=vlc.desktop
video/x-msvideo=vlc.desktop
video/divx=vlc.desktop
video/msvideo=vlc.desktop
video/vnd.divx=vlc.desktop
video/avi=vlc.desktop
video/x-avi=vlc.desktop
video/vnd.rn-realvideo=vlc.desktop
video/mp2t=vlc.desktop
video/mpeg=vlc.desktop
video/mpeg-system=vlc.desktop
video/x-mpeg=vlc.desktop
video/x-mpeg2=vlc.desktop
video/x-mpeg-system=vlc.desktop
video/mp4=vlc.desktop
video/mp4v-es=vlc.desktop
video/x-m4v=vlc.desktop
video/quicktime=vlc.desktop
video/x-matroska=vlc.desktop
video/webm=vlc.desktop
video/3gp=vlc.desktop
video/3gpp=vlc.desktop
video/3gpp2=vlc.desktop
video/vnd.mpegurl=vlc.desktop
video/dv=vlc.desktop
video/x-anim=vlc.desktop
video/x-nsv=vlc.desktop
video/fli=vlc.desktop
video/flv=vlc.desktop
video/x-flc=vlc.desktop
video/x-fli=vlc.desktop
video/x-flv=vlc.desktop
image/jpeg=shotwell-viewer.desktop
image/jpg=shotwell-viewer.desktop
image/pjpeg=shotwell-viewer.desktop
image/png=shotwell-viewer.desktop
image/tiff=shotwell-viewer.desktop
image/x-3fr=shotwell-viewer.desktop
image/x-adobe-dng=shotwell-viewer.desktop
image/x-arw=shotwell-viewer.desktop
image/x-bay=shotwell-viewer.desktop
image/x-bmp=shotwell-viewer.desktop
image/x-canon-cr2=shotwell-viewer.desktop
image/x-canon-crw=shotwell-viewer.desktop
image/x-cap=shotwell-viewer.desktop
image/x-cr2=shotwell-viewer.desktop
image/x-crw=shotwell-viewer.desktop
image/x-dcr=shotwell-viewer.desktop
image/x-dcraw=shotwell-viewer.desktop
image/x-dcs=shotwell-viewer.desktop
image/x-dng=shotwell-viewer.desktop
image/x-drf=shotwell-viewer.desktop
image/x-eip=shotwell-viewer.desktop
image/x-erf=shotwell-viewer.desktop
image/x-fff=shotwell-viewer.desktop
image/x-fuji-raf=shotwell-viewer.desktop
image/x-iiq=shotwell-viewer.desktop
image/x-k25=shotwell-viewer.desktop
image/x-kdc=shotwell-viewer.desktop
image/x-mef=shotwell-viewer.desktop
image/x-minolta-mrw=shotwell-viewer.desktop
image/x-mos=shotwell-viewer.desktop
image/x-mrw=shotwell-viewer.desktop
image/x-nef=shotwell-viewer.desktop
image/x-nikon-nef=shotwell-viewer.desktop
image/x-nrw=shotwell-viewer.desktop
image/x-olympus-orf=shotwell-viewer.desktop
image/x-orf=shotwell-viewer.desktop
image/x-panasonic-raw=shotwell-viewer.desktop
image/x-pef=shotwell-viewer.desktop
image/x-pentax-pef=shotwell-viewer.desktop
image/x-png=shotwell-viewer.desktop
image/x-ptx=shotwell-viewer.desktop
image/x-pxn=shotwell-viewer.desktop
image/x-r3d=shotwell-viewer.desktop
image/x-raf=shotwell-viewer.desktop
image/x-raw=shotwell-viewer.desktop
image/x-rw2=shotwell-viewer.desktop
image/x-rwl=shotwell-viewer.desktop
image/x-rwz=shotwell-viewer.desktop
image/x-sigma-x3f=shotwell-viewer.desktop
image/x-sony-arw=shotwell-viewer.desktop
image/x-sony-sr2=shotwell-viewer.desktop
image/x-sony-srf=shotwell-viewer.desktop
image/x-sr2=shotwell-viewer.desktop
image/x-srf=shotwell-viewer.desktop
image/x-x3f=shotwell-viewer.desktop
x-scheme-handler/chrome=firefox.desktop
application/x-extension-htm=firefox.desktop
application/x-extension-html=firefox.desktop
application/x-extension-shtml=firefox.desktop
application/x-extension-xhtml=firefox.desktop
application/x-extension-xht=firefox.desktop
[Added Associations]
x-scheme-handler/http=firefox.desktop;thunderbird.desktop;
text/html=firefox.desktop;thunderbird.desktop;
application/xhtml+xml=firefox.desktop;thunderbird.desktop;
x-scheme-handler/https=firefox.desktop;thunderbird.desktop;
x-scheme-handler/mailto=thunderbird.desktop;
text/calendar=thunderbird.desktop;
audio/vorbis=rhythmbox.desktop;
audio/x-vorbis=rhythmbox.desktop;
audio/x-scpls=rhythmbox.desktop;
audio/x-mp3=rhythmbox.desktop;
audio/x-mpeg=rhythmbox.desktop;
audio/mpeg=rhythmbox.desktop;
audio/x-mpegurl=rhythmbox.desktop;
audio/x-flac=rhythmbox.desktop;
audio/mp4=rhythmbox.desktop;
audio/x-it=rhythmbox.desktop;
audio/x-mod=rhythmbox.desktop;
audio/x-s3m=rhythmbox.desktop;
audio/x-stm=rhythmbox.desktop;
audio/x-xm=rhythmbox.desktop;
video/ogg=vlc.desktop;
video/x-ogm=vlc.desktop;
video/x-theora+ogg=vlc.desktop;
video/x-theora=vlc.desktop;
video/x-ms-asf=vlc.desktop;
video/x-ms-asf-plugin=vlc.desktop;
video/x-ms-asx=vlc.desktop;
video/x-ms-wm=vlc.desktop;
video/x-ms-wmv=vlc.desktop;
video/x-ms-wmx=vlc.desktop;
video/x-ms-wvx=vlc.desktop;
video/x-msvideo=vlc.desktop;
video/divx=vlc.desktop;
video/msvideo=vlc.desktop;
video/vnd.divx=vlc.desktop;
video/avi=vlc.desktop;
video/x-avi=vlc.desktop;
video/vnd.rn-realvideo=vlc.desktop;
video/mp2t=vlc.desktop;
video/mpeg=vlc.desktop;
video/mpeg-system=vlc.desktop;
video/x-mpeg=vlc.desktop;
video/x-mpeg2=vlc.desktop;
video/x-mpeg-system=vlc.desktop;
video/mp4=vlc.desktop;
video/mp4v-es=vlc.desktop;
video/x-m4v=vlc.desktop;
video/quicktime=vlc.desktop;
video/x-matroska=vlc.desktop;
video/webm=vlc.desktop;
video/3gp=vlc.desktop;
video/3gpp=vlc.desktop;
video/3gpp2=vlc.desktop;
video/vnd.mpegurl=vlc.desktop;
video/dv=vlc.desktop;
video/x-anim=vlc.desktop;
video/x-nsv=vlc.desktop;
video/fli=vlc.desktop;
video/flv=vlc.desktop;
video/x-flc=vlc.desktop;
video/x-fli=vlc.desktop;
video/x-flv=vlc.desktop;
image/jpg=shotwell-viewer.desktop;
image/pjpeg=shotwell-viewer.desktop;
image/png=shotwell-viewer.desktop;
image/tiff=shotwell-viewer.desktop;
image/x-3fr=shotwell-viewer.desktop;
image/x-adobe-dng=shotwell-viewer.desktop;
image/x-arw=shotwell-viewer.desktop;
image/x-bay=shotwell-viewer.desktop;
image/x-bmp=shotwell-viewer.desktop;
image/x-canon-cr2=shotwell-viewer.desktop;
image/x-canon-crw=shotwell-viewer.desktop;
image/x-cap=shotwell-viewer.desktop;
image/x-cr2=shotwell-viewer.desktop;
image/x-crw=shotwell-viewer.desktop;
image/x-dcr=shotwell-viewer.desktop;
image/x-dcraw=shotwell-viewer.desktop;
image/x-dcs=shotwell-viewer.desktop;
image/x-dng=shotwell-viewer.desktop;
image/x-drf=shotwell-viewer.desktop;
image/x-eip=shotwell-viewer.desktop;
image/x-erf=shotwell-viewer.desktop;
image/x-fff=shotwell-viewer.desktop;
image/x-fuji-raf=shotwell-viewer.desktop;
image/x-iiq=shotwell-viewer.desktop;
image/x-k25=shotwell-viewer.desktop;
image/x-kdc=shotwell-viewer.desktop;
image/x-mef=shotwell-viewer.desktop;
image/x-minolta-mrw=shotwell-viewer.desktop;
image/x-mos=shotwell-viewer.desktop;
image/x-mrw=shotwell-viewer.desktop;
image/x-nef=shotwell-viewer.desktop;
image/x-nikon-nef=shotwell-viewer.desktop;
image/x-nrw=shotwell-viewer.desktop;
image/x-olympus-orf=shotwell-viewer.desktop;
image/x-orf=shotwell-viewer.desktop;
image/x-panasonic-raw=shotwell-viewer.desktop;
image/x-pef=shotwell-viewer.desktop;
image/x-pentax-pef=shotwell-viewer.desktop;
image/x-png=shotwell-viewer.desktop;
image/x-ptx=shotwell-viewer.desktop;
image/x-pxn=shotwell-viewer.desktop;
image/x-r3d=shotwell-viewer.desktop;
image/x-raf=shotwell-viewer.desktop;
image/x-raw=shotwell-viewer.desktop;
image/x-rw2=shotwell-viewer.desktop;
image/x-rwl=shotwell-viewer.desktop;
image/x-rwz=shotwell-viewer.desktop;
image/x-sigma-x3f=shotwell-viewer.desktop;
image/x-sony-arw=shotwell-viewer.desktop;
image/x-sony-sr2=shotwell-viewer.desktop;
image/x-sony-srf=shotwell-viewer.desktop;
image/x-sr2=shotwell-viewer.desktop;
image/x-srf=shotwell-viewer.desktop;
image/x-x3f=shotwell-viewer.desktop;
x-scheme-handler/chrome=firefox.desktop;
application/x-extension-htm=firefox.desktop;
application/x-extension-html=firefox.desktop;
application/x-extension-shtml=firefox.desktop;
application/x-extension-xhtml=firefox.desktop;
application/x-extension-xht=firefox.desktop;
