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Keep getting "firefox is in offline mode" errors when I go to youtube

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Very shortly after the latest update, I started getting "firefox is in offline mode" error messages when I try to watch Youtube videos.

URL of affected sites

http://youtube.com

Very shortly after the latest update, I started getting "firefox is in offline mode" error messages when I try to watch Youtube videos. == URL of affected sites == http://youtube.com

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Start Firefox in Use Troubleshoot Mode in Firefox to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems