I need to use version 31.0 as our selenium scripts don't work with 32.0. Can't upgrade selenium as other dependencies cause issues. I have turned off updates in the options menu Issue: i downgrade to 31.0 and all is ok then firefox refuses to open and i get a message saying i need to reboot to complete an upgrade. I believe that because a later version exists on my c drive, firefix tries to install it every time i downgrade to 31.0 I read that the previously downloaded update should appear in c:\user\<user>\appdata\local\mozilla So i went in there and found C:\Users\<user>\AppData\Local\Mozilla\updates and deleted the folder but it doesn't make any difference. The only other folder i have in that mozilla folder is profiles Please can someone tell me how to get rid of the old update so i can stay on 31.0 without having to restart my pc then downgrade to 31.0 every day?