Extensions or add-ons are software programs, typically developed by a third party, that allow you to add features to Firefox to customize your browsing experience.

There are more than 20,000 extensions listed on addons.mozilla.org (AMO), Mozilla’s official directory for Firefox add-ons. Most extensions are created by trustworthy developers. However, bad actors may put your security and privacy at risk by using extensions to compromise your data.

To protect your safety and privacy, you can use these tips to assess the safety of an extension before installation, or install extensions that are regularly reviewed by Mozilla staff. You’ll know if an extension is being regularly reviewed if it has one of the badges listed below on addons.mozilla.org (AMO) and the Add-ons Manager in Firefox.

Recommended Extensions

Are carefully selected extensions that meet rigorous standards in security, functionality, and user experience. The Firefox team, along with community input, handpicks each extension and conducts manual security reviews to ensure they comply with policies before being awarded the "Recommended" status. These exceptional extensions may also be featured in promotions on the AMO homepage and other prominent spots. Importantly, developers cannot pay to have their extensions included in this program.

See the Recommended Extensions article to learn more.

Extensions By Firefox

These extensions are developed by Mozilla to bring new products, unique features, or pure whimsy to Firefox. These extensions are reviewed for security and policy compliance.

Caution label

Extensions that are not regularly reviewed by Mozilla staff will display this caution on AMO: