I use the latest version of Firefox (downloaded from mozilla.org) and have never had that problem with my Windows 7 Toshiba laptop.
However... there is a new problem playing You Tube with Firefox. I heard they have partnered with You Tube to use a certain video player, which constantly buffers. I googled it, and you have to tell Firefox to use Flash instead. I'm not quite sure how to do that, so waiting for my techie son to do it in March.
You might want to try Chrome. But I love Firefox and rarely have problems with it. I look forward to my son fixing the You Tube problem.
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