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addons.mozilla.org
In short: Firefox Add-ons (addons.mozilla.org) accepts extension listing. It is free to submit, takes a moderate amount of preparation, and scores 66/100 on our impact ranking (useful).
Publish privacy/helper extension.
Requires real extension and Mozilla review.
Priority is medium, which sets the band. It is free and moderate to complete, which adjusts it within that band. The score ranks your queue — it is not a measure of domain authority.