Manage Add-ons in Firefox 4

Manage Add-ons in Firefox 4: "Firefox 4 has several new features that weren’t available in previous versions of the browser. The new Add-ons Manager makes it faster and easier to find and install add-ons in Firefox 4. Firefox offers thousands of add-ons, including extensions, themes and Personas that can enhance your browsing experience. All the add-ons are free, but you can make an optional donation if you like."