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Firefox becomes slow after a couple of weeks open
(bugzilla.mozilla.org)
A place to discuss the news and latest developments on the open-source browser Firefox
If it's related to the thread you posted then try Nightly?
Also, can I ask why you'd leave your browser open for weeks? Just curious of the use case. The thread mentions having 5700-7000 open tabs, and I can't fathom why someone would do that. It's not like the websites disappear if you close the tab. Nothing to do with the problem though, you don't have to answer.
I only have around 30 open and I don't turn off the laptop, after a while firefox becomes sluggish and I have to restart it.
Have you tested with specific websites? Could it be a tab has some have JavaScript running constantly that’s causing the issue?
I haven't tested it at my home laptops, but my work laptop all tabs become slow. I have to restart it every time.
You should try that nightly build for troubleshooting purposes
Also, because it forces you to restart the browser every night.