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Re:Firefox 4's JägerMonkey JIT status by thaumaturgy on Tuesday July 13, 2010 @11:05PM (#1513474)
Firefox 4 still has a little ways to go (of course). I've been running the beta since it came out.

I accidentally discovered a neat DoS in Firefox 4 while working on some JS: the alert loop from hell is persistent even after you close the tab. IIRC, in 3 it was possible to close the tab in between alert()s and they would go away; in 4, you'll have to kill and restart Firefox to get rid of them. Chrome still has an advantage there.

Re:Firefox 4's JägerMonkey JIT status by modeless on Tuesday July 13, 2010 @11:11PM (#1513483)
They're working on fixing this the Right Way and right now it's on the list for Firefox 4: https://bugzilla.mozilla.org/show_bug.cgi?id=562258