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addons.mozilla.org
In short: Getting listed on Firefox Add-ons is free. Plan for about 45 minutes — there is material to prepare and a review to wait on.
What they ask for: Publish privacy/helper extension.
Publish privacy/helper extension.
Requires real extension and Mozilla review.
Open the submission page on addons.mozilla.org and complete its form — that is the "Open submit page" link at the top of this page.
Requires real extension and Mozilla review.
Priority sets the band — this one is medium. Cost (free) and effort (moderate) move it within that band, which puts it in the useful tier. The score orders a submission queue. It is not a measure of the site’s domain authority, traffic or quality.