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Problems Viewing Videos

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I had to stop using Firefox over a year ago because almost every time I'd come upon a video, the page went crazy--like it had 5 pages jumping on top of each other. I'd lose control of my mouse and couldn't close Firefox or access Task Manager. Basically, nothing worked. About 3 months ago I tried Firefox again and was so happy because I was able to use it again with no problems--UNTIL the past 2 Firefox updates. Now it's back to the same old problem and I'm back to using Chrome. Why is this happening and is there any solution?

I had to stop using Firefox over a year ago because almost every time I'd come upon a video, the page went crazy--like it had 5 pages jumping on top of each other. I'd lose control of my mouse and couldn't close Firefox or access Task Manager. Basically, nothing worked. About 3 months ago I tried Firefox again and was so happy because I was able to use it again with no problems--UNTIL the past 2 Firefox updates. Now it's back to the same old problem and I'm back to using Chrome. Why is this happening and is there any solution?

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Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings). Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or userChrome. css is causing the problem.

Greeting, Rachel Gomez