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Firefox freezes for around 10 seconds when loading a video on YouTube

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So everytime I'm loading a video on YouTube, it takes a very long time to load (10-15 seconds) and while the video is loading Firefox becomes completely unresponsive. I can't do anything until the video is loaded, and when it takes such a long it becomes annoying.

I have the newest versions of both Firefox and Flash Player.

So everytime I'm loading a video on YouTube, it takes a very long time to load (10-15 seconds) and while the video is loading Firefox becomes completely unresponsive. I can't do anything until the video is loaded, and when it takes such a long it becomes annoying. I have the newest versions of both Firefox and Flash Player.

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Does this happen with other browsers as well? If no, maybe an extension is interfering. Here is how you can disable them to test that: https://support.mozilla.org/en-US/kb/Uninstalling%20add-ons#w_how-to-disable-extensions0-personassf-and-plugins