Nice to see that you are the brain behind this extension either.
It made searching multiple times easier than the standard Thunderbird search "crap".
Now, as I see you may still concentrate quite much time on your extensions to "overcome" the enhancements of v.68 ...
Boring to see, how Mozilla does NOT CARE on its supporters, and abruptly alters Thunderbird's API, so that NO extensions work anymore...
So, WE your most trustful supporters (the users of your extensions) want to thank you one more for your nice work. We apologize for Mozilla's weak strategy in regard to its free-APIs, and we want to give you support to keep your nice work.
Many thanks again!