Please consider turning on send info to Mozilla before posting a question. This helps us help you. As I have no info from your system that would help see things that cause issues. Just to be on the safe side please update your graphic card drivers. Bad drivers can create a range of different problems. You mention uninstall so lets go with that again. Please turn off any extensions you may have. Then please uninstall Firefox. Delete all Mozilla Firefox folders in C:\Program Files and C:\Program Files(x86) then reboot. When return run Windows Disk Cleanup and clear all Temp folders. Then run it again and this time click button Cleanup System Files. Reinstall Firefox 56.0.2 from a Full Version Installer https://www.mozilla.org/firefox/all/ See how it runs then start turning on Extensions 1 at a time, each time restarting Firefox. If have a issue with one remove it. If still continued issues it maybe a Profile issue and a new one needs to be created. Note : Firefox 57 Quantum release date Nov 14th https://www.mozilla.org/en-US/firefox/quantum/ Note : Legacy Extensions will be disabled and or removed. Please let us know if this solved your issue or if need further assistance.