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How do I fix firefox, which hangs when plug in container starts?

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Firefox hangs or freezes & I can't click on anything when plug in container shows up (see it in task manager).

Firefox hangs or freezes & I can't click on anything when plug in container shows up (see it in task manager).

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There are some compatibility issues between the latest Flash player and some Firefox add-ons or settings. Flash 11.3.300.257, in particular, can cause crashes. Please check out these articles: