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<p>As earlier announced, the support for traditional add-ons has
today been removed from Thunderbird nightly builds, going to beta
soon.<br>
</p>
<p>Going forwards, add-ons need to be written as either <a
moz-do-not-send="true"
href="https://thunderbird-webextensions.readthedocs.io/en/latest/">MailExtensions</a>,
or <a moz-do-not-send="true"
href="https://thunderbird-webextensions.readthedocs.io/en/latest/how-to/experiments.html">MailExtension
Experiments</a>. The latter allows using XPCOM and other
technologies used in traditional add-ons, but will be prone to
breakage if you're not willing to keep up with what's happening in
core development.<br>
</p>
<p>There are no changes for the 68.x series. <br>
</p>
<p> -Magnus<br>
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