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After updating to 10.01 why cant i open more than 1 window ?

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Before i updated i could 2 or 3 windows open at once but not now. Crtl N doesn't work either.

Before i updated i could 2 or 3 windows open at once but not now. Crtl N doesn't work either.

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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).