hi, thanks for reporting this. could you go to the firefox menu ≡ > help ? > troubleshooting information page and take a look in the Accessibility section if accessibility is set to "true" there.

if yes, can you please copy & paste this whole section into a reply in the forum and see if the following fixes 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.

i tried this and it didnt make it any better. I am now waiting minutes for an email to pop up after i click it

You may want to consider the age of the computer and when did it have it's last Video Card Update, how much ram, did it ever get any Bios Flashes or Updated Motherboard Drivers when it was in warranty and add it all together it may mean you have Topped the highest hills with this but it is now on the slow ride down.

It maybe worth considering to move to the ESR Version.

52.5.0 ESR is secure. It will continue to get security updates until May 2018, and you can download and install it from this page: https://www.mozilla.org/en-US/firefox/organizations/all/ Note : Legacy Extensions will be deleted or removed in any version update after May 2018.

You should make a backup of your Profile before going back and just because: https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

As well : Windows 8.1 falls under the same life cycle policy as Windows 8, and will reach end of Mainstream Support on January 9, 2018

Please let us know if this solved your issue or if need further assistance.