After the download finishes, close all Firefox windows (or open the Firefox menu and click the close button ).Download the latest Desktop version of Firefox from (or choose the download for your operating system and language from this page) and save the setup file to your computer.This process does not remove your Firefox profile data (such as bookmarks and passwords), since that information is stored in a different location. This means you remove your Firefox program files and then reinstall Firefox. Make sure you followed all the steps in performing a Clean reinstall. Try temporarily disabling Win Defender and any other security software you have on the PC. Hi, try PCs Start button > Restart (do not use Shutdown because in Win10 - by default, Fast Startup is enabled, which doesn't actually shut down the PC)!
