Hiii.....

please : go to the Firefox 3 Bar Menu --> Options --> Privacy & Security panel and under Permissions check (put a tick in the box) 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...Test and go up again , go back down, it will eventually get a zone you and it can live with.

Go to 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.

Wow, you saved my life, thank you :D

most welcome

I am having the same problem, and unfortunately, there is no entry "Prevent Accessibility Services from accessing your browser." Waterfox lately has been havng the same problem, so much so that I uninstalled it and reinstalled Firefox, which seemed great at first, but then it started doing this hanging thing again.