Since MacOs recent update (High Sierra), Firefox hangs within minutes of opening.
I am not a 100% sure but I think that since Mac updated to the latest version of High Sierra 10.13.2, Firefox hangs each time I try to use it. It becomes totally unresponsive, and I have to force quit each time. Initially I thought it might be because of the number of tabs open so I reduced them, then started a new session, but to no avail. I even uninstalled and reinstalled (although it was the latest version earlier). Finally it dawned on me that the only change had been Mac OS updating. I have had to stop using Firefox completely. I had submitted a couple of feedbacks while it worked but it appeared that the interval since opening and hanging was decreasing progressively and I can now barely get a minute out of it.
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Please : Go to the Firefox 3 Bar Menu --> Help ? --> Troubleshooting Information Page and take a look in the Accessibility section if accessibility is set to "true" there. if yes, go to the Firefox 3 Bar Menu --> Options --> Privacy & Security panel and under Permissions check the setting to Prevent Accessibility Services from accessing your browser.
Monitor in Task Manager. Should stay below 2 gigs. If excessive then do below and monitor and change if need to.
Go the 3 Bar Menu then Options --> General --> Performance and untick everything. change the recommended size lower then see how it runs. Note: 1 = No Multiprocessor = slow again. Try 2 Restart Firefox after making these changes please.
Please let us know if this solved your issue or if need further assistance