Hitting this same problem in Kubuntu 20.04. My case is this. In /usr/share/applications/defaults.list I had this: application/pdf=org.gnome.Evince.desktop;google-chrome.desktop
I guess the trailing ";google-chrome.desktop" was in some way added by installing Chrome. Firefox says my default PDF application is Chrome, while all the other system components (Dolphin, xdg-mime, xdg-open) correctly say that my default is Okular. After editing /usr/share/applications/defaults.list to remove the trailing ";google-chrome.desktop", now Firefox correctly knows my default application for PDFs is Okular. No need to restart Firefox, the change was immediate. Strange enough, I don't have Evince installed, but many other file types are associated with Evince in that defaults.list file. I guess Evince is ignored because it is not installed. On the contrary, Chrome is installed and so it's honored by Firefox, but in this case it's skipping and ignoring my actual system settings for PDF file association. So, there must be some problem here. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to firefox in Ubuntu. https://bugs.launchpad.net/bugs/1551171 Title: /usr/share/applications/mimeinfo.cache is used for default applications in Firefox Status in Mozilla Firefox: Confirmed Status in firefox package in Ubuntu: New Bug description: See https://bugzilla.mozilla.org/show_bug.cgi?id=727422 With Firefox, default applications are selected by Firefox using /usr/share/applications/mimeinfo.cache, however, this list is a system generated list in random order and therefor does not reflect the user's preferences of which application should be used to open a file. When I click on a pdf (for example), I want to have the option to open it in my default application, in my case in okular, and not in something else. However, acroread is invariably presented is presented as default choice because it happens to be the first entry in /usr/share/applications/mimeinfo.cache for application/pdf. This happens in spite of the fact that the desktop provides correct defaults.list and mimeapps.list files The comments in the firefox bug seem to suggest that firefox developers are convinced that firefox calls the correct gtk libraries to determine the correct application. If this is the case, then it is necessarily the ubuntu (or possibly kubuntu) infrastructure to be failing. ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: firefox 44.0.2+build1-0ubuntu0.15.10.1 ProcVersionSignature: Ubuntu 4.2.0-30.36-generic 4.2.8-ckt3 Uname: Linux 4.2.0-30-generic x86_64 ApportVersion: 2.19.1-0ubuntu5 Architecture: amd64 BuildID: 20160209234513 CurrentDesktop: KDE Date: Mon Feb 29 11:37:25 2016 EcryptfsInUse: Yes InstallationDate: Installed on 2013-12-12 (808 days ago) InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) SourcePackage: firefox UpgradeStatus: Upgraded to wily on 2015-10-23 (129 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/firefox/+bug/1551171/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
