Since I updated to Quantum, about every hour of browser run time it hangs on some action. Firefox uses 100% of CPU, the entire system hangs for a few minutes, then it recovers. I have tried all the steps here https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding and I’ve done this go to the firefox menu ≡ > options > privacy & security panel and under permissions check the setting to prevent accessibility services from accessing your browser. I am on a Mac OS X El Capitan 10.11.6