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Mozilla announced the Recommended Extensions program for Firefox on April 9, 2019 designed to promote excellent extensions for Firefox in various ways.

Extensions need to meet the "highest standards of security, utility, and user experience", be in active development, safe, offer exceptional user experience, and be really good at what they do.

The program goes beyond the featured extensions listing that Mozilla uses currently on the official repository for add-ons.

Recommended extensions will be reviewed by human reviewers before they are accepted in the program, and then each time an update is released. Human reviews reduce risks associated with automatic review systems significantly; it would look really bad if Mozilla would recommend and promote an extension that would do something shady.

Mozilla plans to promote the extensions in several ways, e.g. on the official Add-ons repository and through the contextual extension recommendation feature of the Firefox browser.

Mozilla mentioned that it contacted several developers already but did not mention names or specific add-ons that it considers for the program.

Popularity may play a role in the initial selection phase but it is likely that popularity -- user counts and ratings -- are not the only factors. If an extension is well designed and exceptional, it is probably a candidate even if the user count is low in comparison.

Tip: A good starting point is our best of Firefox add-ons listing.

Mozilla and the extension developer both need to be willing to accept an extension in the Recommended Extensions program.