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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
Most software in general has hard to detect issues after several weeks of uptime. Its something that's fundamentally hard to test and fix. Its a big reason why "did you turn it off and on again" is such universal advice.
People really out here treating their web browser like it's a mainframe
Even if the software was perfect, virtually all desktop RAM isn't ECC equipped, so you potentially have even the hardware corrupting the state and requiring restarting because of that.