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When Firefox gets totally slow and one of the Firefox processes consumes 100% of one CPU, why does killing that process suddenly fix the slow browsing?

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Usually killing a process kills the program, but not with Firefox, it makes it better. Totally weird.

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The multi processes splits the load on tabs to multiple processes so if one crashes you don't lose the whole program. I suspect you might have some tabs that are being loaded up to 100% CPU on the second process, and killing it frees up that cpu and enable to the first process to keep trucking along

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