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addons.thunderbird.net
In short: Getting listed on Thunderbird Add-ons is free. Plan for about 45 minutes — there is material to prepare and a review to wait on.
What they ask for: Build a legitimate Thunderbird MailExtension, complete its add-on page and submit it through the Developer Hub.
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.
Open the submission page on addons.thunderbird.net and complete its form — that is the "Open submit page" link at the top of this page.
Must comply with Thunderbird technical, security, privacy, licensing and review policies.
Priority sets the band — this one is high. Cost (free) and effort (moderate) move it within that band, which puts it in the high impact tier. The score orders a submission queue. It is not a measure of the site’s domain authority, traffic or quality.