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opera.com
In short: Opera Add-ons (opera.com) accepts public browser extension listing. It is free to submit, takes a moderate amount of preparation, and scores 66/100 on our impact ranking (useful).
Package a useful your tool browser feature as an Opera extension and submit it for moderation.
Extension needs one clear purpose, complete metadata, policy compliance, and moderator approval.
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.