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.
In my experience this doesn’t matter. Firefox just slows down if it’s been open for long, regardless for how long the tab has been open for. Even if you unload all active tabs and open a new one, that new tab will still be significantly slower than it would be if you restarted the entire browser.
It’s some kind of slow resource leak somewhere.