hi, thanks for reporting this. can you try if this change can workaround the performance problem?: go to the firefox menu ≡ > options > privacy & security panel and under permissions check the setting to prevent accessibility services from accessing your browser.

Thanks Philipp, that seems to have solved the issue.

I changed above suggestion and still Firefox is SLOW.

I did what you suggested - everything is crawling - can't even type on any pages without having to wait every couple of words for "catch up" - it's very annoying. I'm running Windows 10 and only Firefox - so I wish you could fix this or stop auto updating.

Pages that had fully loaded - when I go back to them (multiple windows open) - they have to load all over again :(

It used to work just great - now I spend too much time waiting for the same pages to reload.