Windows 10 reached EOS (end of support) on October 14, 2025. For more information, see this article.

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

Heavy memory usage with Firefox

  • 4 பதிலளிப்புகள்
  • 0 இந்த பிரச்னைகள் உள்ளது
  • 2 views
  • Last reply by jonzn4SUSE

While running Firefox on MacBookAir with macOS 15.7.2 to browse simple websites I keep getting the below warning message. I may have 2 or 3 other apps open (like Apple Mail, MS-Word, Preview). "Heavy memory usage You're running out of memory and your Mac may become noticeably slower. Consider quitting some applications. Firefox 2,48 GB" So I quit Firefox to re-open again and continue my work. Does somebody has an hint where this message can come from ? Any settings to change on my MAC ? Thanks for helping

While running Firefox on MacBookAir with macOS 15.7.2 to browse simple websites I keep getting the below warning message. I may have 2 or 3 other apps open (like Apple Mail, MS-Word, Preview). "Heavy memory usage You're running out of memory and your Mac may become noticeably slower. Consider quitting some applications. Firefox 2,48 GB" So I quit Firefox to re-open again and continue my work. Does somebody has an hint where this message can come from ? Any settings to change on my MAC ? Thanks for helping
Attached screenshots

All Replies (4)

WOW!!! How much memory does you mac have? 2 or 3 apps open and getting low ram warnings...

jonzn4SUSE மூலமாக திருத்தப்பட்டது

Here's the activity from my 2012 mac running 10.13.6. see screenshot The isolated web content is from the FISSION Project. links below

Firefox's Project Fission:

Introducing Firefox’s new Site Isolation Security Architecture https://hacks.mozilla.org/2021/05/introducing-firefox-new-site-isolation-security-architecture/

Firefox's Project Fission: better security and more processes https://www.ghacks.net/2019/02/07/firefoxs-project-fission-better-security-and-more-processes/

Enable Fission in Firefox https://www.ghacks.net/2020/09/20/you-can-try-firefoxs-site-isolation-feature-fission-in-nightly-now/

Change how many processes multi-process Firefox uses https://www.ghacks.net/2016/02/15/change-how-many-processes-multi-process-firefox-uses/

2,48 GB doesn't make sense. However, 48 = 32 + 16, so I'm guessing it means there are two sticks totalling 48 GB. Still quite a bit.

Not sure if it's the same in your version of mac, but if you have something similar to the activity monitor in my screenshot take a look at it. Or just click on the apple icon in the upper left corner and then about this mac.

jonzn4SUSE மூலமாக திருத்தப்பட்டது

கேள்வி எழுப்பு

You must log in to your account to reply to posts. Please start a new question, if you do not have an account yet.