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firefox flashplayer black screen problem - solution
I recently had a very frustrating problem with Flashplayer. Whenever I tried to watch any kind of Flash video, the video would black out - and any tab I opened would be blacked out, as well. Eventually, the browser would crash completely. Found a problem about it in Mozilla support, but no solution.
Long story short, the problem was AdBlock Plus. (It may have gotten corrupted somehow???)
When I completely REMOVED it - restarted FireFox - then reinstalled AdBlock Plus, the problem was fixed.
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I will lock the question since you have already solved it. If you are interested in helping other users check out out how to contribute page.