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plugin container won't open (not in task manager, plugins don't work)

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Plugin container.exe doesn't show up in task manager upon opening Firefox. When I try to load a video on youtube, the video is a black box, no buttons or timeline, just a black box.

I've tried: -safe mode -updating plugins -using the Run program to open plugin container.exe (nothing happens) -manually clicking on plugin container.exe in the program files folder (nothing happens) -restarting my computer (3 times) -opening plugin hang ui.exe (nothing happens)

Plugin container.exe doesn't show up in task manager upon opening Firefox. When I try to load a video on youtube, the video is a black box, no buttons or timeline, just a black box. I've tried: -safe mode -updating plugins -using the Run program to open plugin container.exe (nothing happens) -manually clicking on plugin container.exe in the program files folder (nothing happens) -restarting my computer (3 times) -opening plugin hang ui.exe (nothing happens)

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html5 player doesn't work. I've been using chrome to use plugins (as NONE of them work on firefox, as, as I said, the plugin container doesn't even launch) but chrome is so laggy that I can't do other things while watching videos.

please help