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addons.thunderbird.net
In short: Thunderbird Add-ons (addons.thunderbird.net) accepts mailextension listing. It is free to submit, takes a moderate amount of preparation, and scores 84/100 on our impact ranking (high impact).
Build a legitimate Thunderbird MailExtension, complete its add-on page and submit it through the Developer Hub.
Must comply with Thunderbird technical, security, privacy, licensing and review policies.
Priority is high, 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.