Question

i've got the same problem with every youtube video now, after firefox updated itself to 14.0.1

take a wild guess if it's annoying the **** out of me or not? :o @x64 xp

had the same problem since upgrading to 14.

tried downgrading to 13 but for some reason the problem came with, probably because i didnt do a full uninstall and erase of settings.

anyway, go here http://www.youtube.com/html5/ and opt out of the trial.

if you read the script error it always has to do with html5 so i figured that was the issue.

I see the same happening with that video, so it looks that the script isn't fully compatible with Firefox.

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

Same problem and has caused BSOD when trying to load.

Tried extending the time FF will wait for script to load as well and just causes browser to freeze.

mazurkfsflip's fix worked

This is definitely not a Firefox 14+ problem! I had the same "Unresponsive script" popup with the YT HTML5 player using Firefox 11.0 on Ubuntu (10.10). I guess YouTube did some "upgrade" that didn't go quite well. Probably somebody missed to run a few unit tests or failed to submit the new code to QA for an UAT before deploying it to production ... :-(

So far the only workaround I've found is to leave the HTML5 trial on the YT page (http://www.youtube.com/html5/) and use the flash video player. :-(

The HTML5 player works with Chrome v20.0.1132.43 though ... I guess they did test only on Chrome. :-(

P.S.: I did test this with a completely new+clean Firefox profile (created a new profile, visited the YT HTML5 trial opt-in page and enabled the HTML5 player, then visited a YouTube video with the HTML5 player and got the "Unresponsive script" error/popup). And on the same computer with the same installed plugins (+versions) this worked without a problem just a few days ago (I guess the problem started occuring sometime yesterday or maybe the day before that ... I'm not quite sure).

mazurkfsflip is correct. Its an HTML5 youtube - firefox incompatibility. Go to the link in his post to opt out of the HTML5 trial and problem solved (for now).

In order to fix this problem go on the HTML5 page ( http://www.youtube.com/html5 ) at the bottom of the page, you will see "You are currently in the HTML5 trial." and "Leave the HTML5 Trial". Click on the second option and you will get rid of this error.

Thanks for the tip, it worked. However, clicking on the link you left gave a 404 error, but going to youtube and typing the html5 part worked. :)

for the record, as of this moment, the error says "Script: http://s.ytimg.com/yt/jsbin/html5player-vflGWJljH.js:53", 5 lines back

Thanks a lot! I thought it was a flash 11.3 error, but realized it was not after I had uninstalled the flash player and was still able to view videos (after waiting for the script to load, 20 seconds or so) on youtube. And thanks a lot Google for opting us in for something we didn't want to opt in for! Sleazy bastards.

If you don't have Flash installed then YouTube will use HTML5 player if your browser supports it. It didn't try to sneak anything in, just trying to help.

Guys, Chrome has absolutely no problems with the same pages on HTML5 youtube.Disabling HTML5 is a temporary solution, but this just puts us back to the other ugly situation where Firefox crushes and burns on every second flash video. It seems to me that this is a problem Mozilla has to deal with.

Well, other browsers also have problems. YouTube broke this and (as far as I know) they're working on it to fix this. This problem has nothing to do with the update to Firefox 14.0.1, it's also broken in Firefox 13 (I checked).

Youtube and everything was working fine until this afternoon. Trying to play YouTube just gets error messages about unresponsive scripts, and the browser locks up.

I got out of the HTML5 trials. When they get rid of the bugs and make it worth using, they can let me know.

Unfortunately Firefox and Flash 11.3 may have some issues and some may be trying HTML5 because of FlashPlayer issues.

Google know about the issue, and they should be updating the website later today.

What a ridiculous thing to have done to a great sum of people...jeez Google?!?!

I tell you what...I'll let you know if I want to be in a Beta...

Looks like Google/YouTube fixed the problem.

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.