dstiles - 10:00 pm on Oct 28, 2011 (gmt 0)
I run FF on Ubuntu with approx 7 windows totalling about 100 tabs. The only times I close it are FF updates or if Ubuntu requests a re-boot after an update (rare). Works reasonably well though slow first thing in the day because over-night Ubuntu runs a major backup operation, snaffling all the memory. M/C is not a high-spec one.
My wife runs FF on Windows 2000 (as I used to) with about a dozen tabs in a single window; sometimes two windows with another half-dozen tabs. Quite low-spec machine but she has no problems with FF and only reboots when new FF or something else upsets the OS - about every few weeks, say.
I must say I like this new form textarea-field re-sizing. It's simplified larger postings quite a bit, easier to see what I've written. :)