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.

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

freezes

  • 4 cavab
  • 4 have this problem
  • 2 views
  • Last reply by FredMcD

more options

Firefox causes computer to freeze, primarily while watching videos on YouTube.

Firefox causes computer to freeze, primarily while watching videos on YouTube.

Chosen solution

FredMcD said

Some added toolbar and anti-virus add-ons are known to cause Firefox issues. Disable All of them.

It appears an add-on was the culprit here, namely, OpenH264. Once I disabled it, the video problems went away. This was not an add-on I introduced to my browser, it comes, evidently, with V34 &V35.

Read this answer in context 👍 0

All Replies (4)

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
  • Do NOT click the Reset button on the Safe Mode start window

You can check for problems with current Shockwave Flash plugin versions and try this:

See also:

more options

Some added toolbar and anti-virus add-ons are known to cause Firefox issues. Disable All of them.

more options

Seçilmiş Həll

FredMcD said

Some added toolbar and anti-virus add-ons are known to cause Firefox issues. Disable All of them.

It appears an add-on was the culprit here, namely, OpenH264. Once I disabled it, the video problems went away. This was not an add-on I introduced to my browser, it comes, evidently, with V34 &V35.

more options

Good work. Well done.