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Firefox becomes slow after a couple of weeks open (bugzilla.mozilla.org)

submitted 5 days ago by [email protected] to c/[email protected]

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Does anyone have this issue were firefox becomes slow if left open for a long time. In my case after a couple of weeks rendering becomes slow and when I use youtube for example if is laggy, just trying to change volume taka few second to show the volume bar. It also happens to my laptop at work. I have around 30 tabs open.

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[–] [email protected] 10 points 4 days ago (1 children)

I've seen poorly made websites taking gigabytes of RAM before. It's not firefox' fault they do that.

[–] [email protected] 2 points 4 days ago (1 children)

True that, I just thought it was crazy. I had recently upgraded to 96 gigs of RAM and I just never imagined a browser would actually suck up that much.

[–] [email protected] 2 points 4 days ago* (last edited 22 hours ago)

If you had 80GB worth of websites that did something actually useful with it, you'd want Firefox to use it all.

I usually have dozens of tabs loaded due to usage and I want Firefox to keep all of them into memory so that I can switch between them quicker.

Though I do also want Firefox to shed load by unloading some of them whe I need memory for something else. There just simply isn't a mechanism in Linux to do that AFAIK; Firefox will happily keep all of its tabs loaded all the way until OOM eventhough it could shed most of them with little impact on user experience. There isn't a way for the kernel to ask applications to shed memory load on their own and I think there should be.
macOS has such a mechanism and Firefox uses it but it didn't have much effect IME, so it might have been bugged. That was a good while ago that I tested it though.

Edit: I just found out that there actually is a sort of standard mechanism now: https://systemd.io/MEMORY_PRESSURE/
I don't think firefox implements it but it's also kinda new.