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YouTube HTML5 Unresponsive Script Error


With YouTube HTML5 mode (http://www.youtube.com/html5 ) enabled, any video played with the HTML5 player will give me a unresponsive script error on "Script: http://s.ytimg.com/yt/jsbin/html5player-vflGWJljH.js:58"

Note that not all videos play on the HTML5 player. Try this video: http://www.youtube.com/watch?v=cdgQpa1pUUE

Howard Forum Wiki gives me unresponsive script error as well. Go to http://www.howardforums.com/showwiki.php?title=Android+Wiki:About and click on the Discussion tab and I get an error from "Script: http://www.howardforums.com/clientscript/vault/reset.js?v=3014:285" script.

Modified by OuHiroshi

Chosen solution

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

Read this answer in context 9

Additional System Details

This happened

Every time Firefox opened

This started when...

Updated to FireFox 14

Installed Plug-ins

  • 1.122.0
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Next Generation Java Plug-in 10.5.1 for Mozilla browsers
  • 5.1.10411.0
  • 1.118.0
  • Version
  • Google Talk Plugin Video Accelerator version:
  • 0.70.4
  • Google Update
  • The plug-in allows you to open and edit files using Microsoft Office applications
  • Office Authorization plug-in for NPAPI browsers


  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20100101 Firefox/14.0.1

More Information

-Reinstalling FireFox
-Uninstalling Flash
-Scan for viruses with MSE
-FireFox safe mode

muzso 0 solutions 2 answers

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

ivorybow 0 solutions 4 answers

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

redrooster 0 solutions 3 answers

Thanks mcsmurf, I'll give it a try.

DukeTwicep 0 solutions 2 answers

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.

ivorybow 0 solutions 4 answers

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

  • Top 25 Contributor
  • Moderator
622 solutions 8023 answers

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.

Modified by John99

Cheng Wang
  • Administrator
  • Moderator
36 solutions 435 answers

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.

yiannos 0 solutions 4 answers

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...

mcsmurf 0 solutions 3 answers

@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.

yiannos 0 solutions 4 answers

@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.

  • Top 25 Contributor
  • Moderator
622 solutions 8023 answers

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.


 "....  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).


 ".... 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.

Cheng Wang
  • Administrator
  • Moderator
36 solutions 435 answers

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.

  • Top 10 Contributor
  • Moderator
10756 solutions 96800 answers

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.

winthp 0 solutions 1 answers

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.