Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more.

The official Mozilla site for downloading Firefox extensions and themes. Add new features and change the browser’s appearance to customize your web experience.

Download Firefox Extensions to add features that customize browsing. Protect passwords, find deals, enhance video, and block annoying ads with browser apps.

To use these add-ons, you'll need to download Firefox.

Download themes to change how Firefox looks. Tailor your experience to your tastes. Cute critters, evil robots, beautiful landscapes—thousands of options.

Download Firefox dictionaries and language pack extensions. Add a new language option to your browser spell-checker, or change the browser's interface language.

Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more.