Thunderbird got mothballed for a few years as Mozilla no longer saw it as a priority so it was only receiving small fixes and patches in the ESR channel. After

Thunderbird got mothballed for a few years as Mozilla no longer saw it as a priority so it was only receiving small fixes and patches in the ESR channel. After a long process of pushing from some motivated developers it recently was de-coupled from Mozilla in order to allow it to live or die by it's own communities initiative. Since it's spin-off it's been developed at breakneck speeds to desperately bring it up to par with modern Firefox (they share back-end technologies) in order to make it's development more sustainable and predictable. Unfortunately this has been a strain on add-on developers like myself. I was maintain the lookout TNEF parsing plugin however due to the pace of the changes and an increase in lack of time I'm now only putting out small fires