Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

This thread was archived. Please ask a new question if you need help.

how can I find the add-on that slows FF to a crawl?

  • 1 reply
  • 1 has this problem
  • 5 views
  • Last reply by cor-el

utahjerry1
utahjerry1
more options

one or more add-on's is slowing FF to a crawl. Task mgr shows the memory usage is sometimes more than 1e6 k-bites. Disabling FF add-ins solves problem. What should I do?

one or more add-on's is slowing FF to a crawl. Task mgr shows the memory usage is sometimes more than 1e6 k-bites. Disabling FF add-ins solves problem. What should I do?

All Replies (1)

cor-el
cor-el
  • Moderator
  • Top 10 Contributor
more options

It is possible that one or more extensions have memory leaks.

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

If it works in Safe Mode and in normal mode with all extensions (Firefox/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)