dstiles - 10:02 pm on Dec 30, 2011 (gmt 0)
No problem with extensive use of FF since before 3.6. This is on Linux Ubuntu (me) and Windows 2000 (wife). My own use is typically 6 windows open with about 50+ tabs between them.
I would never use chrome because a) it has a lot of exploitable flaws in it and b) it's google, which means a privacy issue at the very least.