Question

After upgrading to 20.0.1 cannot open a new window (CTRL+N) and no add-ons seem to work (apart from adblock plus).

Unable to open new window (but able to open new tabs). Sometimes unable to open Add-ons tab. The add-on extensions do not seem to be working, even though they seem to be ENABLED (except adblock plus).

When restarting in safe mode, or disabling ALL add-ons the browser works normally, thus new windows open, add-on tab opens etc.

Tried to enable one thing at a time, but it seems that when enabling WHICHEVER TWO add-ons, firefox starts acting "weirdly" (no new windows etc.).

Tried disabling hardware acceleration, but it didn't solve the problem.

Tried uninstalling firefox and then reinstalling. At first it all seemed working perfectly well: new windows opened, extensions working etc. But after a couple of restarts (of firefox and computer) it all got back to the same situation.

Tried uninstalling ALL add-ons and everything worked well. After installing the SECOND add-on and restarting firefox things get "wrong" again.

It all started after upgrading to Firefox 20.0.1.

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