Mozilla editorial staff identify feature worthy content. When evaluating extensions, curators are primarily concerned with:
Does the extension function at an exemplary level? All Recommended extensions should not only function as they promise, but function at an extremely high level. For instance, there are many ad blockers out there, but not all ad blockers are equally effective.
Is the extension safe? Firefox is committed to helping protect you against third-party software that may inadvertently compromise your data —or worse— breach your privacy with malicious intent. Before an extension receives Recommended status, it undergoes rigorous technical review by staff security experts.
Does the extension offer an exceptional user experience? Recommended extensions should be delightful to use, so curators look for content that is easy to manage and well designed.
Is the extension relevant to a general, international audience? The tightly-curated nature of Recommended extensions means we may only feature up to a few hundred, or less, at a time. We try to select content that will be relevant to Firefox users around the globe.
Is the extension actively developed? Developers of Recommended extensions must maintain their content to ensure it evolves with the needs of Firefox users.
Where do I find Recommended extensions?
You can discover Recommended extensions on addons.mozilla.org (AMO), a hosting platform where you can explore thousands of extensions and themes (custom skins for Firefox).
Recommended extensions are indicated by special badging:
No. All Recommended content is curated solely for the purpose of providing Firefox users with great browsing tools and experiences.
What are the risks of installing non-recommended extensions?
There are thousands of extensions and the vast majority are built with honest intent to provide people with useful tools and features. But even extensions built with the best intentions may inadvertently expose or otherwise compromise sensitive data.
Also, unfortunately, there are a few bad actors out there intent on stealing user data. One method of mining information can be through tricking users into installing malicious extensions.
Due to the curated nature of Recommended extensions, each extension undergoes a thorough technical security review to ensure it adheres to Mozilla’s add-on policies.
To be clear, just because an extension is not Recommended, that doesn't mean it's unsafe. It simply means it's not vetted by Mozilla and you should install at your own risk. Here are additional tips for assessing the safety of an extension.