Firefox Started Crashing on Bluefin

Firefox Flatpak was working fine on Bluefin, but has now started crashing.

I’m on 39 and it’s stable so far…

Firefox 125.0.3, running fine on 40 here with custom CSS and extensions. Does it keep crashing in safe mode also?

If you can launch normal Firefox and use it, open the hamburger menu, click on Help > Troubleshoot Mode > Restart. Alternatively flatpak run --command=firefox org.mozilla.firefox --safe-mode should invoke it from the terminal. Or you can also try creating a new profile by right clicking the Firefox icon > Open the Profile Manager. If these prevent crashes, your crashes might be isolated to your default profile (extensions, user prefs, etc.)