This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Ova tema je arhivirana. Pitajte drugo pitanje ako vam je potrebna pomoć.

When watching video the video will slowdown while the audio is fine.

  • 4 odgovori
  • 2 ima ovaj problem
  • 2 views
  • Posljednji odgovor poslao Bill

Bill
Bill
more options

When I'm watching a video the video portion will slow down several times while the audio is fine. I usually have to pause the video until it catches up to the audio to continue to watch it. I ran task manager in Win XP and noticed that when this problem occurs, Firefox is running at 98-100% of CPU usage. What might be causing this issue and how can I resolve it. Any help would be greatly appreciated.

Bill

When I'm watching a video the video portion will slow down several times while the audio is fine. I usually have to pause the video until it catches up to the audio to continue to watch it. I ran task manager in Win XP and noticed that when this problem occurs, Firefox is running at 98-100% of CPU usage. What might be causing this issue and how can I resolve it. Any help would be greatly appreciated. Bill

All Replies (4)

iamjayakumars
iamjayakumars
more options

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).

To Enable SafeMode

  • You can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
  • Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.
  • Once you get the pop-up, just select "'Start in Safe Mode"

If it works in Safe Mode and in normal mode with all extensions (Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.

Close and restart Firefox after each change via "Firefox > Exit" (Windows: Firefox/File > Exit; Mac: "Firefox > Quit Firefox"; Linux: "Firefox/File > Quit")

Bill
Bill Vlasnik pitanja
more options

I started Firefox in safe mode but still have the issue with video running slow and task mgr is still showing Firefox running at 99%. Starting in safe mode seem to have no effect.

iamjayakumars
iamjayakumars
more options

Create a new profile as a test to check if your current profile is causing the problems. See "Creating a profile":

Profile Backup and Restore

Bill
Bill Vlasnik pitanja
more options

Thank you for your help. It appears that creating a new profile solves the problem. So I guess my next question is why is my original profile causing this issue and how do I resolve the problem?