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[Bug 1497843] Re: when setting firefox as default browser it becomes default app to open .PNG files

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** Description changed:

  Hi,
  
- I've had the unpleasant surprise to discover that if I play with the default browser to something else like Chrome, Opera or Vivaldi and the revert to either Firefox or Firefox Nightly (firefox-trunk)  then Firefox (or the nightly, depending on which I select as the new default) become the default program with which Nautilus (Files) tries to open .PNG files.
-  
- I suppose it might be related to their .desktop files. For example, Chrome and Opera have these Mimetypes specified, respectively:
+ I've had the unpleasant surprise to discover that if I play with the
+ default browser to something else like Chrome, Opera or Vivaldi and the
+ revert to either Firefox or Firefox Nightly (firefox-trunk)  then
+ Firefox (or the nightly, depending on which I select as the new default)
+ become the default program with which Nautilus (Files) tries to open
+ .PNG files.
  
- MimeType=text/html;text/xml;application/xhtml_xml;image/webp;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;
-  
- MimeType=text/html;text/xml;application/xhtml_xml;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;
+ I suppose it might be related to their .desktop files. For example,
+ Chrome and Opera have these Mimetypes specified, respectively:
+ 
+ MimeType=text/html;text/xml;application/xhtml_xml;image/webp;x-scheme-
+ handler/http;x-scheme-handler/https;x-scheme-handler/ftp;
+ 
+ MimeType=text/html;text/xml;application/xhtml_xml;x-scheme-
+ handler/http;x-scheme-handler/https;x-scheme-handler/ftp;
  
  Firefox and Firefox Nightly:
-  
- MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
  
-  
- MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x-scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x-scheme-handler/chrome;video/webm;application/x-xpinstall;
+ MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x
+ -scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x
+ -scheme-handler/chrome;video/webm;application/x-xpinstall;
+ 
+ MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x
+ -scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x
+ -scheme-handler/chrome;video/webm;application/x-xpinstall;
  
  (they're the same)
-  
- So I edited /usr/share/applications/firefox.desktop and removed the "image/png" bit and solved the problem for Firefox. The un-modified firefox-trunk.desktop file still has causes the problem. Weirdly enough, the default application to open .jpg files does not change.
-  
- Why does the firefox.desktop file require all the additonal "noise" when we have plenty of other applications to handle those mimetypes? The other browsers seem to do just fine with their shorter MimeType lines.
+ 
+ So I edited /usr/share/applications/firefox.desktop and removed the
+ "image/png" bit and solved the problem for Firefox. The un-modified
+ firefox-trunk.desktop file still causes the problem. Weirdly enough, the
+ default application to open .jpg files does not change.
+ 
+ Why does the firefox.desktop file require all the additonal "noise" when
+ we have plenty of other applications to handle those mimetypes? The
+ other browsers seem to do just fine with their shorter MimeType lines.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: firefox 40.0.3+build1-0ubuntu0.14.04.1
  Uname: Linux 4.1.7-040107-generic x86_64
  NonfreeKernelModules: nvidia
  AddonCompatCheckDisabled: False
  ApportVersion: 2.14.1-0ubuntu3.13
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  silviu     2596 F.... pulseaudio
-  /dev/snd/pcmC0D0p:   silviu     2596 F...m pulseaudio
-  /dev/snd/controlC0:  silviu     2596 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  silviu     2596 F.... pulseaudio
+  /dev/snd/pcmC0D0p:   silviu     2596 F...m pulseaudio
+  /dev/snd/controlC0:  silviu     2596 F.... pulseaudio
  BuildID: 20150826185918
  Channel: Unavailable
  CurrentDesktop: Unity
  Date: Mon Sep 21 09:14:05 2015
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IfupdownConfig:
-  # interfaces(5) file used by ifup(8) and ifdown(8)
-  auto lo
-  iface lo inet loopback
+  # interfaces(5) file used by ifup(8) and ifdown(8)
+  auto lo
+  iface lo inet loopback
  IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
  InstallationDate: Installed on 2014-12-19 (275 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  IpRoute:
-  default via 192.168.1.1 dev eth1  proto static 
-  172.17.0.0/16 dev docker0  proto kernel  scope link  src 172.17.42.1 
-  192.168.1.0/24 dev eth1  proto kernel  scope link  src 192.168.1.5  metric 1
+  default via 192.168.1.1 dev eth1  proto static
+  172.17.0.0/16 dev docker0  proto kernel  scope link  src 172.17.42.1
+  192.168.1.0/24 dev eth1  proto kernel  scope link  src 192.168.1.5  metric 1
  Locales: extensions.sqlite corrupt or missing
  PrefSources:
-  prefs.js
-  [Profile]/extensions/support@xxxxxxxxxxxx/defaults/preferences/defaults.js
+  prefs.js
+  [Profile]/extensions/support@xxxxxxxxxxxx/defaults/preferences/defaults.js
  Profiles: Profile0 (Default) - LastVersion=40.0.3/20150826185918 (In use)
  RelatedPackageVersions:
-  gecko-mediaplayer 1.0.8-4ubuntu1
-  totem-mozilla     3.10.1-1ubuntu4
-  rhythmbox-mozilla 3.0.2-0ubuntu2
+  gecko-mediaplayer 1.0.8-4ubuntu1
+  totem-mozilla     3.10.1-1ubuntu4
+  rhythmbox-mozilla 3.0.2-0ubuntu2
  RfKill:
-  
+ 
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:
-  
+ 
  dmi.bios.date: 10/27/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1104
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8P67 LE
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0X
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1104:bd10/27/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8P67LE:rvrRevX.0X:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

-- 
You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1497843

Title:
  when setting firefox as default browser it becomes default app to open
  .PNG files

Status in firefox package in Ubuntu:
  New

Bug description:
  Hi,

  I've had the unpleasant surprise to discover that if I play with the
  default browser to something else like Chrome, Opera or Vivaldi and
  the revert to either Firefox or Firefox Nightly (firefox-trunk)  then
  Firefox (or the nightly, depending on which I select as the new
  default) become the default program with which Nautilus (Files) tries
  to open .PNG files.

  I suppose it might be related to their .desktop files. For example,
  Chrome and Opera have these Mimetypes specified, respectively:

  MimeType=text/html;text/xml;application/xhtml_xml;image/webp;x-scheme-
  handler/http;x-scheme-handler/https;x-scheme-handler/ftp;

  MimeType=text/html;text/xml;application/xhtml_xml;x-scheme-
  handler/http;x-scheme-handler/https;x-scheme-handler/ftp;

  Firefox and Firefox Nightly:

  MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x
  -scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x
  -scheme-handler/chrome;video/webm;application/x-xpinstall;

  MimeType=text/html;text/xml;application/xhtml+xml;application/xml;application/rss+xml;application/rdf+xml;image/gif;image/jpeg;image/png;x
  -scheme-handler/http;x-scheme-handler/https;x-scheme-handler/ftp;x
  -scheme-handler/chrome;video/webm;application/x-xpinstall;

  (they're the same)

  So I edited /usr/share/applications/firefox.desktop and removed the
  "image/png" bit and solved the problem for Firefox. The un-modified
  firefox-trunk.desktop file still causes the problem. Weirdly enough,
  the default application to open .jpg files does not change.

  Why does the firefox.desktop file require all the additonal "noise"
  when we have plenty of other applications to handle those mimetypes?
  The other browsers seem to do just fine with their shorter MimeType
  lines.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: firefox 40.0.3+build1-0ubuntu0.14.04.1
  Uname: Linux 4.1.7-040107-generic x86_64
  NonfreeKernelModules: nvidia
  AddonCompatCheckDisabled: False
  ApportVersion: 2.14.1-0ubuntu3.13
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  silviu     2596 F.... pulseaudio
   /dev/snd/pcmC0D0p:   silviu     2596 F...m pulseaudio
   /dev/snd/controlC0:  silviu     2596 F.... pulseaudio
  BuildID: 20150826185918
  Channel: Unavailable
  CurrentDesktop: Unity
  Date: Mon Sep 21 09:14:05 2015
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions: Unavailable (corrupt or non-existant compatibility.ini or extensions.sqlite)
  InstallationDate: Installed on 2014-12-19 (275 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  IpRoute:
   default via 192.168.1.1 dev eth1  proto static
   172.17.0.0/16 dev docker0  proto kernel  scope link  src 172.17.42.1
   192.168.1.0/24 dev eth1  proto kernel  scope link  src 192.168.1.5  metric 1
  Locales: extensions.sqlite corrupt or missing
  PrefSources:
   prefs.js
   [Profile]/extensions/support@xxxxxxxxxxxx/defaults/preferences/defaults.js
  Profiles: Profile0 (Default) - LastVersion=40.0.3/20150826185918 (In use)
  RelatedPackageVersions:
   gecko-mediaplayer 1.0.8-4ubuntu1
   totem-mozilla     3.10.1-1ubuntu4
   rhythmbox-mozilla 3.0.2-0ubuntu2
  RfKill:

  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:

  dmi.bios.date: 10/27/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1104
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8P67 LE
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0X
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1104:bd10/27/2011:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8P67LE:rvrRevX.0X:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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References

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