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Why facebook turn firefox into hole black screen?

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While i'm seeing videos from my wall or others wall and were on the same wall more than 30 minutes(more or less), on my firefox all page starts flashing in black or white, in other words i see all screen black, so i can't see the tabs but if i clic on correct position i can close tab. is there any cause of this? its quite annoying.

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Please see if uninstalling Flash as detailed at improves things.

You can also try in "Safe Mode" ("Hamburguer" > "?" > "Restart with Add-ons Disabled") and see if that helps.

Please let us know if this solves your question.