Default browser changed from firefox to chrome

[Fabian]

Upgraded from 21.04 to 21.10. Using firefox since forever as default browser (with chrome as sporadic backup)
After the upgrade, my default browser switched to chrome.
No big problem, changed it back to FF in the settings

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: ubuntu-release-upgrader-core 1:21.10.8
ProcVersionSignature: Ubuntu 5.13.0-19.19-generic 5.13.14
Uname: Linux 5.13.0-19-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
CasperMD5CheckResult: unknown
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 18 16:02:01 2021
InstallationDate: Installed on 2020-11-03 (349 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: Upgraded to impish on 2021-10-18 (0 days ago)
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

I was able to recreate this by installing chromium-browser on Hirsute and then upgrading to Impish. x-www-browser went from launching Firefox to launching Chrome.

[Olivier Tilloy (osomon)]

This was also discussed here: https://forum.snapcraft.io/t/firefox-snap-cannot-be-set-as-default-browser/26636

[Sebastien Bacher (seb128)]

Reassigning to firefox, the issue is that snaps have no integration with the alternatives system so x-www-browser isn't pointing to firefox as it used to. We checked the archive for users of the alternative and we those we not important enough to consider the issue as a rls blocker for impish. We will get it to for the LTS as we complete the firefox deb to snap transition.