Although Mozilla is reviewing the extensions available in the official add-ons store for Firefox, the process is now working using the "publish first/review later" approach. However, the Recommended Extensions program comes with a list of curated extensions that comply with Mozilla's "highest standards of security, utility, and user experience."
https://www.notebookcheck.net/Firefox-Recommended-Extensions-program-coming-this-summer.416023.0.html