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.
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.