https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues ------------ Many site issues can be caused by corrupt cookies or cache. '''Warning ! ! ''' This will log you out of sites you're logged in to. You may also lose any settings for that website. * [https://support.mozilla.org/en-US/kb/delete-cookies-remove-info-websites-stored Delete cookies to remove the information websites have stored on your computer] {web link} * [https://support.mozilla.org/en-US/kb/how-clear-firefox-cache How to clear the Firefox cache] {web link} If there is still a problem, '''[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode]''' {web link} by holding down the '''<Shift> ''(Mac=Options)''''' key, and then starting Firefox. A small dialog should appear. Click '''Start In Safe Mode''' (not Refresh). Did this help? While you are in safe mode; Try disabling graphics hardware acceleration in Firefox. Since this feature was added to Firefox it has gradually improved but there are still a few glitches. ''[https://support.mozilla.org/en-US/kb/forum-response-disable-hardware-acceleration How to disable Hardware Acceleration]'' {web link}

Youtube works fine in safe mode after performing the instructions specified by you, but does not seem to work outside safe mode

''VIjayrajS [[#answer-1212972|said]]'' <blockquote> Youtube works fine in safe mode after performing the instructions specified by you, but does not seem to work outside safe mode </blockquote> This would indicate something is blocking YT access during normal browsing. You need to go back and disable all Addons and then security software and turn on and off Addons one at a time to find the problem software.