Rated 5 out of 5 stars

Lightning 1.3 works fine with TB 11.0!!

Now that Thunderbird has released Version 12 Beta, perhaps the Developer could update Lightning once again!

This review is for a previous version of the add-on (1.3).  This user has other reviews of this add-on.

Lightning 1.4b1 is already uploaded to addons.mozilla.org, you just have to install it from the "Developer Channel" box on Lightning's page on addons.mozilla.org.