hi, thank you for reporting this problem. can you please test if the following steps can fix the performance issue you're seeing in firefox 57?: enter about:config into the firefox address bar (confirm the info message in case it shows up) & search for the preference named accessibility.force_disabled. double-click it, change its value to 1 and restart firefox once.

then please let us know how this goes?

philipp said

hi, thank you for reporting this problem. can you please test if the following steps can fix the performance issue you're seeing in firefox 57?: enter about:config into the firefox address bar (confirm the info message in case it shows up) & search for the preference named accessibility.force_disabled. double-click it, change its value to 1 and restart firefox once. then please let us know how this goes?

Not the OP, but I had the same problem. When the new Firefox update came, FF stopped working on my Windows 10 laptop at work (it was and is fine on my Windows 7 personal laptop). It would open up and be fine (if slow) for a minute or two, and then start hanging. Refreshing Firefox did nothing to solve the problem. But going into about:config and changing the value specified fixed the problem.

If it helps you figure out how to prevent this problem for other people in the future, I use Classic Shell in Windows 10 so I can get a usable start button back.

The about:config did the trick. Thank You so much