Add-ons are installable enhancements to the Mozilla Foundation’s projects (and compatible variants such as Portable Firefox). Add-ons allow the user to add or augment application features, use themes to his or her liking, and handle new types of content.

Also copied from Wikipedia. Add-ons are everything that makes Firefox useful. Here on FeatureFox, I will be featuring add-ons that will make Firefox better to YOUR likings, such as: Alerts & Updates for all your messengers and/or social profiles, the local weather, sets for web developers, music & picture add-ons, and also, security & privacy add-ons. But don’t forget the themes! Themes are what make your browser look & feel great. You can’t go around having the original theme on your browser. It just doesn’t feel good. So, stay up to date, and get ready for the greatest add-on’s ever!

Mozilla Firefox is a free and open source web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation. Firefox had 22.47% of the recorded usage share of web browsers as of July 2009^[update], making it the second most popular browser in terms of current use worldwide, after Microsoft’s Internet Explorer.

Copied straight from Wikipedia. Basically Firefox is by far in over 1 million people’s opinions the best web browser of all time. Firefox has made it far, marking it’s 3rd version. You can download firefox totally free at Mozilla’s web site: Stay tuned for a post about extensions.