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Ramdomly high IO activity when watching video

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It usually happens when I loading page or watching video on YouTube/ Bahamut Anime( When it occurs, the video still can play until the video cache empty, and after switching to another and switching back, the page becomes all white except a loading circle at the center. This situation takes about 3~5 minutes. I have tried refresh firefox, and disable all addons.

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Sorry to read you're having issues with video playback on your Firefox.

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