To Bad your IT Person did not Contact us . You can pass along two fixes to him for future use. And maybe for your reinstall. 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. And this should be used with thought as no point in downloading it if take away the Multiprocessor support. Go the Menu then Tools --> Options --> Performance and untick everything. change the recommended size lower then see how it runs. Note: 0 = No Multi-processor = slow again. Hardware Acceleration might have also been a issue so turn it off. Run it later and see as you turn things back on and test it, and again. Restart Firefox after making these changes please. Only recommend browser if going down, Look in Help --> About As for older version I hope he put you on a supported browser : Going back : unfortunately 56.0.2 is no longer safe to use for every day use do to security issues, but52.5.0 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/ <b>Note : Legacy Extensions will be deleted or removed in any version update after May 2018</b>. Be missing this : https://www.howtogeek.com/333110/how-to-customize-firefox-quantum-and-remove-the-white-space-around-the-title-bar/ Please let us know if this solved your issue or if need further assistance.