firefox will operate normally for about 5 seconds and then won't respond for about 10 seconds in a repeating sequence. Why?
I'm running Windows 10 build 1703 and Firefox 57 64-bit. I've deleted my old firefox 32-bit directories after making sure to uninstall this version. I then deleted my old version of firefox 57 and then deleted those directories also. I've then reinstalled firefox with a new download of firefox. I've run in safe mode. Nothing seems to get rid of this staring and stopping as I've indicated above.
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(Update to the Windows 10 Fall creator's update, I've seen some performance issues fixed by that update)
Also, try disabling Accessibility Services in Firefox. How do I disable Accessibility Services?