Note: The below directions apply to Firefox 2 or older. More updated directions canbe found at The Firefox Extension Guru’s Wiki. Here is a neat little trick to open the Add-Ons and Download Managers into the sidebar instead of a new window: From the Bookmarks Menu, select Organize Bookmarks Click the New Bookmark Button In Name field enter what you want to call this bookmark (Add-Ons or Downloads) In the Location field copy/paste the appropriate address below: Add-Ons: chrome://mozapps/content/extensions/extensions.xul Downloads: chrome://mozapps/content/downloads/downloads.xul Check the box: Load this bookmark in sidebar Click OK To make it even easier to access the Add-Ons…