1918065 - High CPU/RAM utilisation using Firefox ESR without internet connectivity

Status: UNCONFIRMED

(Core :: Performance, defect)

Description

[Riccardo]

Attachment: photo_2024-09-11_12-33-50.jpg

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Steps to reproduce:

We have a web application developed in Flutter that works offline, i.e. without internet connectivity but only access to our web server.

We use Firefox ESR 115.14 (Also found with 115.8), after a few hours the CPU usage and RAM used by Firefox processes is saturated reaching 100%.

We solved the problem by deactivating Data Collection and Software protection (We removed all blue ticks visible in the screenshoot)

Actual results:

The problem does not seem to occur very frequently but happens at least once a day, when it does, the customer is forced to switch the kiosk off and on again.

Expected results:

Are there specific settings for using Firefox ESR offline?

Comment 1

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

The Bugbug bot thinks this bug should belong to the 'Core::Privacy: Anti-Tracking' 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.

:r.cucia, 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

[Alessandro]

Attachment: memory-report.json.gz

Memory dump during crash of web page using firefox-esr 115.15.0esr+build1-0ubuntu0.22.04.1~mt1 amd64

Comment 4

[Alessandro]

Attachment: about_support.Copy raw data to clipboard.txt

This is the report taken from the about:support button "Copy raw data to clipboard"