Firefox 135 Window Doesn't Show

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Hi!

I just upgraded to Kinoite 41.20250209.0 and Firefox would not open.
When I run firefox in a terminal, the process starts but no window opens. No errors from the command or in journalctl either.
firefox -safe-mode does the same thing too.

I’ve rolled back to 41.20250206.0 for now, which has Firefox 134.

How can I go about finding the cause of this issue? I’ve already done the troubleshooting steps I know about.

Thanks in advance!
Pete

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I’d try moving the .mozilla folder and starting Firefox without profiles/fresh.

I’m not sure what else to suggest if firefox in Terminal isn’t reporting anything, but I’m typing this from 135.0 now on 41 Workstation.

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Thanks for the suggestion, I did try moving the whole .mozilla folder to .mozilla.old, made sure to pkill firefox and tried again, but that also yielded the same result. I’m very confused.
Maybe it’s a Plasma 6 bug