I can confirm. Works for me too now. :-)

Thanks mcsmurf! I would never have figured this out, and your solution solved my problem completely.

Thanks mcsmurf, I'll give it a try.

No that's not correct. I had the html5 errors long before I uninstalled flash, it has absolutely nothing to do with not having flash installed.

Duke, What worked for me was going to the link McSmurf offered and I turned off youtube HTML 5. http://www.youtube.com/html5

No that's not correct. I had the html5 errors long before I uninstalled flash, it has absolutely nothing to do with not having flash installed.

I am not saying having FlashPlayer installed; or not having it installed; causes the script errors on HTML5. I am pointing out that because of Firefox & Flash 11.3 problems users may be using You Tubes HTML5 option.

I note there are posts upthread saying Google was aware of the problem and should now have fixed this, although I have not myself attempted to find the Google/YouTube announcement.

This has NOTHING to do with Flash. It's specific to HTML5 video on Youtube.

Google pushed a fix to their HTML5 youtube player yesterday morning to address this. Hold shift and click reload the youtube page and it should work now.

In my case this problem only started after the upgrade to version 14. I don't understand why we are putting the blame on youtube. The issue does not appear on Chrome and did not appear before version 14 on FF. At the same time, we are talking about the browse which still can't properly work well with applets and of late Flash (win7 x64). By the way, the only change I'm seeing today is that youtube uses flash, even tough I haven't opted out of the HTML5 beta. Overall, in my case I find it harder every day to keep using FF as my default browser...

@yiannos: YouTube breaking at the same time the FF update came out is just some coincidence. I tested with the old Firefox 13 version, the unresponsive script error also happened with that version of Firefox.

@mcsmurf: I see what you are saying. From my PC it is now impossible to see the HTML5 version of youtube videos on any browser. Obviously Google thinks there is a problem too.

It is a fact however that FF has been having problems after v4 with both Applets and Flash objects. Add that to a sense of faster rendering on Chrome (no matter what benchmarks may say), a multitude of crashes that I keep having every day (again, due to plugins), and it just keeps getting harder to trust Mozilla.

It may help if you start separate threads for separate problems instead of many people posting questions in the same thread.

Please try to keep it to one question with proposed solutions in a single thread. If you have a separate problem, even a similar one start a new thread, cross link it if you think that helps.
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 "....  and it just keeps getting harder to trust Mozilla.   .... " 

Unfortunately Mozilla Firefox staff may not be rushing to post proposed solutions for Flash 11.3 problems, and I see no mention of anyone else doing much (FlashPlayer may have a new release, but I am not sure yet if that has been shown to help).
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 ".... Obviously Google thinks there is a problem too.   .... " 

If you find information that is worth mentioning, and you think others will be interested in it, then it helps if you provide a link to the source of that information.

Let's not talk about Flash here, it's not relevant to the issue in this thread.

We got word from Google that they pushed a Youtube fix that should get rid of the unresponsive script error. Are you saying that that fix doesn't solve the problem with HTML5 video (Flash video is completely different)? I can take that message back to Google but I'd like confirmation that it's indeed not fixed.

I can confirm that the link to the HTML5 video that was posted on page one is now starting with a less than one second delay where it first didn't.

• http://www.youtube.com/watch?v=cdgQpa1pUUE&html5=1

That YouTube HTML5 link saved me man (or woman). You are my hero. I was going nuts trying to figure out my YouTube videos problem, uninstalling newer plugins and reinstalling Flash and so forth. All along it was YouTube/Google's default opt-in to a damn beta trial that I didn't know anything about that was screwing me over.

I had to thank you so much I registered here. Seems kinda stupid support.mozilla.org and addons.mozilla.org use different authentication databases. Came as a surprise.