Remember that Firefox grew out of Mozilla, which came out of the remnants of Netscape way back in the late 90s.
What version is CHROME on? Most of the updates address minor bugs but full version numbers are usually large(r) advances. Firefox releases come from beta testing by geeks who know what picante sauce a good browser is made of. This time they made good on their promise last spring to clean up add-ons etc.
I haven't had it hang or toss it's salad yet so far. So far the multiple instances it normally runs have behaved nicely too. I'm really surprised!