1920597 - Firefox is taking up soooo much RAM (2GB+). I tried using Arc & Chrome to the same amount and it was taking way less (less than 1GB))

Status: UNCONFIRMED

(Core :: Performance, defect)

Description

[ri]

Attachment: memory-report.json

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:130.0) Gecko/20100101 Firefox/130.0

Steps to reproduce:

1. Open Firefox 130.0.01 on a MacBook M1 Pro, 16GB RAM, Sonama 14.5
2. Install Sidebery extension and create 5 panels, with 4 pinned tabs that are always active.
3. Open 5-20 additional active tabs and 150 unloaded/inactive tabs
4. 1 hour later, check Activity Monitor.

• Firefox takes up 2GB+ on my machine
• "FirefoxCP Isolated Web Content" will have opened up for each active tab, taking up about 300-800MB.

I saw some bugs related, but I didn't exactly see a solution. Apologies if this has been resolved already!

Actual results:

Firefox is always taking up 1GB+ RAM.
"FirefoxCP Isolated Web Content" is opened for each tab and it will take up around 300-800MB.

Expected results:

Firefox should only take around 800MB (which is how much Arc/Chrome are taking up).
Not sure what "FirefoxCP Isolated Web Content" is the Arc/Chrome equivalent of.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Performance' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

This bug was moved into the Performance component.

:zhan.rita.info, could you make sure the following information is on this bug?

• For slowness or high CPU usage, capture a profile with http://profiler.firefox.com/, upload it and share the link here.
• ✅ For memory usage issues, capture a memory dump from about:memory and attach it to this bug.
• Troubleshooting information: Go to about:support, click "Copy raw data to clipboard", paste it into a file, save it, and attach the file here.

If the requested information is already in the bug, please confirm it is recent.

Thank you.

Comment 3

[ri]

Attachment: about-support raw data.txt

Comment 4

[ri]

Profile Capture

Comment 5

[Frank Doty [:fdoty]]

Removing perf impact flag and adding to memory investigation meta bu - please continue to provide additional details to help us remedy any possible issues

Comment 6

[Bas Schouten (:bas.schouten)]

Most of the memory here appears to be used by Google, where you are logged in and using the Calendar and various other applications. Are you certain that the circumstances you tested here were the same on Chrome? It also appears that your extensions are using a fairly large amount of memory but that can't explain the whole difference.