Add-ons allow Firefox users to extend the capabilities of the Firefox web browser. The Mozilla foundation, the organization behind Firefox, manages a central repository of trustworthy, approved add-ons, but does not create them. As with all things coming from the internet, approach Firefox add-ons with a certain amount of caution.
You can access the Add-on manager from within Firefox by going to Tools→Add-ons. The Add-on manager allows you to:
It also provides information about browser plugins (Flash player, Adobe Reader, etc.), and provides quick access to browser personas and themes.
You can also visit Mozilla's add-ons site for a more comprehensive overview of a particular add-on, including user reviews and ratings, the add-on author's name and contact information, and a detailed description.
Open the add-on manager or visit the site. Search for an add-on, using words that succinctly describe the add-on's function. When you've found something, click the 'Add to Firefox' button, which appears in the add-on manager and on the site.
The add-ons search, installation and configuration functions no longer appear in a pop-up dialog, but on a special page that appears directly in the browser. You can reach the add-ons page by:
See figs 3–5 below.
The ones that make your web-browsing more productive, more enjoyable, or both.
That said, the author likes:
Clicking the 'Add to Firefox...' button downloads and installs the add-on. You'll need to restart Firefox to begin using it.