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Why do Youtube video's fail to play and say "Ooops :( Failed to find any playable video url. All urls are not signed."

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  • 1 has this problem
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  • Last reply by cor-el

g.rodneythurman
g.rodneythurman
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The above message comes up when ever I attempt to play a YouTube video. Google, and YouTube say it's a browser issue. I am totally frustrated with the failure to get help with this issue.

The above message comes up when ever I attempt to play a YouTube video. Google, and YouTube say it's a browser issue. I am totally frustrated with the failure to get help with this issue.

All Replies (1)

cor-el
cor-el
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  • Top 10 Contributor
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Your System Details List shows that you have quit a few Flash plugins installed. 

Shockwave Flash 11.3 r300
Shockwave Flash 11.5 r502
Shockwave Flash 12.0 r0
Shockwave Flash 15.0 r0
Shockwave Flash 16.0 r0

You can find the installation path of all plugins on the about:plugins page.

You can uninstall the current Flash player version and (re)install the latest Flash version.

See this about uninstalling Flash players:

Note that this will remove all installed Flash players.

You can find the latest Flash player versions for Firefox on this page:

Your issue can be caused by an extension that isn't working properly or is interfering otherwise.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

  • Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
  • Do NOT click the Reset button on the Safe Mode start window