Firefox Quantum eating RAM while even not used

(NeedInfo from)



2 months ago
17 days ago


(Reporter: me, Unassigned, NeedInfo)


58 Branch

Firefox Tracking Flags

(Not tracked)




2 months ago
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36

Steps to reproduce:

1. install firefox quantum
2. open one tab
3. measure ram usage during few hours while firefox is not used

Actual results:

Firefox is using more and more ram over time. And if I open some other heavier website it uses enormous amount of ram (>1gb)

Expected results:

Lower ram usage as in other browsers. See the pictures attached where I compared Chrome, Safari and Firefox In the last picture there is memory tab opened, gfx part is rising over time
It's probably due to one of your extensions. Please troubleshoot with Safe Mode:

Comment 2

2 months ago
Kohei, I had 2 plugins installed (lastpass and vuejs plugins), but I had them disabled because I also suspected plugins was the issue. But even if they are, if desabled they should not make problems, right?
Anyhow, I removed plugins and done the same thing : 
steps : 
1.vanilla firefox quantum install without anything added google search for firefox
3.leave it in background for a few hours

results : 
Firefox rose from ~250mb at start to around 700 by activity monitor and less by firefox about:memory page (and it rose there too over time).
Relevant screenshot

I`ll try in safe mode also.
Tested on Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:57.0) Gecko/20100101 Firefox/57.0 ID:20171112125346 and 
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:57.0) Gecko/20100101 Firefox/57.0 and could not reproduce the issue.
Additional Notes:
- Firefox process started with ~300 MB memory in use and after ~2hours, the process was using below 300 MB memory(~250MB) via activity monitor (with google search for Firefox as instructed in bug description)
- CPU usage under 1%, in idle, during testing
─ 10.54 MB (06.48%) -- GFX usage - live measurement  - after 2 hours Please try to reproduce the issue using Safe Mode as Kohei Yoshino suggested and let us know the result please. Thank you
Flags: needinfo?(me)

Comment 4

17 days ago
(In reply to Deac Alin-Desktop Engineering QA from comment #3)
> ...
> Please try to reproduce the issue using Safe Mode as Kohei
> Yoshino suggested and let us know the result please. Thank you

Reporter seems to be gone
Last Resolved: 17 days ago
Resolution: --- → INCOMPLETE
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