Intent to de-support: traditional add-ons

Magnus Melin mkmelin+mozilla at
Tue Oct 1 18:32:00 UTC 2019

To clarify, Thunderbird 72 is only a beta. We only release final 
versions on the ESR cycle, so for end users next versions after 
Thunderbird 68 will be (likely) Thunderbird 78.

So add-on authors have time to adapt until next summer, but always best 
to start early.


On 01-10-2019 19:35, Emmanuel SELLIER wrote:
> Hello,
> Could you explain what you mean in :
> TB72 would be publicly released before end of 2019?
> Or the deadline (for the public) is TB78?
> The remaining time is quite short;
> We haven't moved to MailExtension since the API did not meet (yet) all of our needs.
> Regards,
> Emmanuel
>>>> On 01/10/2019 16:02, Magnus Melin wrote:
>>>>> It's not yet clear exactly when we're ready to rip out the support for
>>>>> traditional add-ons from the code base, but it should be whitin the
>>>>> Thunderbird 72 time frame - so by end of 2019. The next major version of
>>>>> Thunderbird, version 78, will be out around June 2020. Up until then,
>>>>> code wise many things are going to change. For instance, what is left of
>>>>> XUL will be gradually going away, and documents will shifted to being
>>>>> XHTML with a less and less XUL flavor.
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