Since the latest update (to 44.0, on win7), FF has been consuming nearly every available clock cycle - 60%-70% on my 6-core, 3.5GHz machine. Why?!??
Since the latest update (to 44.0, on win7), FF has been keeping my cpu "pegged" (eating 60%-70% on my 6 core, 3.5GHz machine. IMO, this should *never* happen and is at least, at *some* level, a major regression. I do keep many window/tabs open but, it's never been this bad before. This is while no videos are playing (though I expect there's plenty of javascript running "quietly" on many pages, as is the way of the web these days). Is this a "known issue", is it being addressed (hopefully) ?
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Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox. Is the problem still there?
https://support.mozilla.org/en-US/kb/websites-look-wrong-or-appear-differently
https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster
https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix
https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding
https://support.mozilla.org/kb/Firefox+is+already+running+but+is+not+responding