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.

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

Why does Firefox leak memory after. I do the same operations in Firefox and Safari, Firefox in some cases uses over 500 MB of RAM, Safari uses about 50 MB

  • 1 reply
  • 2 have this problem
  • 3 views
  • Last reply by cor-el

more options

After opening and closing 5 windows in Firefox and Safari, at rest Firefox still claimed (approx.) 500MB of real memory, Safari return all memory and claimed only (approx.) 50MB at rest (all windows closed). My laptop starts over heating when browsing just simple information pages in Firefox. This still happens after updating to the latest browser.

After opening and closing 5 windows in Firefox and Safari, at rest Firefox still claimed (approx.) 500MB of real memory, Safari return all memory and claimed only (approx.) 50MB at rest (all windows closed). My laptop starts over heating when browsing just simple information pages in Firefox. This still happens after updating to the latest browser.

All Replies (1)

more options

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance/Themes).