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Re:Firefox 27 Released by ndesaulniers on Wednesday February 05, 2014 @05:46PM (#7187416)
Firefox will stop any client side JavaScript after 5-6s and ask whether you want to keep running the slow running script or not. If will even change to that tab before prompting you. Isn't that what you just described?
Re:Firefox 27 Released by ZoFreX on Thursday February 06, 2014 @10:56AM (#7190955)
Only if it totally locks up the browser though, not if the browser remains responsive but eats a lot of cycles.