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What can I do to stop Firefox from lagging on movies like on youtube?

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I normally have quite a lot of lag when I'm watching movies on youtube or (for the dutch people) dumpert. When I use another browser to watch the video, I don't have any lag at all.

I normally have quite a lot of lag when I'm watching movies on youtube or (for the dutch people) dumpert. When I use another browser to watch the video, I don't have any lag at all.

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The Reset Firefox feature can fix many issues by restoring Firefox to its factory default state while saving your essential information. Note: This will cause you to lose any Extensions, Open websites, and some Preferences.

To Reset Firefox do the following:

  1. Go to Firefox > Help > Troubleshooting Information.
  2. Click the "Reset Firefox" button.
  3. Firefox will close and reset. After Firefox is done, it will show a window with the information that is imported. Click Finish.
  4. Firefox will open with all factory defaults applied.


Further information can be found in the Refresh Firefox - reset add-ons and settings article.

Did this fix your problems? Please report back to us!

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You can check for problems caused by recent Flash updates and try these:

  • disable a possible RealPlayer Browser Record Plugin extension for Firefox and update the RealPlayer if installed
  • disable protected mode in Flash 11.3 and later
  • disable hardware acceleration in the Flash plugin

Try to disable hardware acceleration in Firefox.

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Update your graphic card driver.

My graphic card is a Geforce and the problem was fix after the update installation and a computer reboot.

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Check if this issue is with other browsers too.