[theGeatZhopa]

Running 24/7 with often system suspension and standby with at least 3 windows open with approx 150 tabs in each window. since +60d without restart. Win10.

When you get a lockup when Firefox is running, check your network card drivers and your graphic card drivers. In my experience, locking of systems is caused by software accessing some faulty interfaces/drivers. I speak for Windows.

Oh yeah, I don't like updates for restarting reasons, so it's still the newest but not the latest version