1)  Uninstall Firefox from your computer.

   2)  Delete the Firefox installation folder (located in one of these folders by default):

 3)  [https://www.mozilla.org/firefox/new/#download-fx] 

4)   Double-click on the downloaded file and follow the prompts to continue the installation process. 

hello katiecaras '''Here's how to do a clean install of Firefox:''' 1) Uninstall Firefox from your computer. 2) Delete the Firefox installation folder (located in one of these folders by default): * C:\Program Files\Mozilla Firefox * C:\Program Files (x86)\Mozilla Firefox 3) <img src="https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/gallery/images/2014-12-23-05-25-41-0a158e.png">[[https://www.mozilla.org/firefox/new/#download-fx]] 4) Double-click on the downloaded file and follow the prompts to continue the installation process. For more information on how to install Firefox, see [[How to download and install Firefox on Windows. ]] https://support.mozilla.org/en-US/kb/firefox-keeps-crashing-startup tell me its help and mark solution. thank you!