$ grep firefox /var/log/pacman.log
[2025-08-14T17:33:44+0100] [ALPM] upgraded firefox (141.0-1 -> 141.0.3-1)
[2025-08-14T17:33:44+0100] [ALPM] upgraded firefox-i18n-en-gb (141.0-1 -> 141.0.3-1)
[2025-08-21T10:26:01+0100] [ALPM] upgraded firefox (141.0.3-1 -> 142.0-1)
[2025-08-21T10:26:01+0100] [ALPM] upgraded firefox-i18n-en-gb (141.0.3-1 -> 142.0-1)
Anyone having problems with latest version of Firefox should check out Firefox troubleshooting tools
firefox --new-window about:support
Or
firefox --new-window about:profiles
to manage profiles