Thread: Resetting Firefox options

I've read advice online and on your site about making changes to the Firefox browser using the about:config page. I am worried that I can't find an Undo option in case I make a mistake. Can any changes be reversed?

It is possible to reset options back to their original setting, so there is no need to worry about remembering the default option. To do this, right-click on the setting, then left-click on Reset in the menu that appears. Restart Firefox to make the change. Click on the red Close icon in the top right-hand comer of the Firefox window, then start the browser in the usual way.