Hello, I installed an add-on called "Restore Old Fast Theme of YouTube" from here: https://addons.mozilla.org/en-US/firefox/addon/restore-fast-theme-of-youtube/ But after realizing it wasn't the right thing for me I tried to remove it but it seems to have permanently altered my YouTube. I tried restarting the browser but it is stuck on. How is it able to do this? I have removed it so it should be back to normal but it is not. Thank you for any help