Rated 4 out of 5 stars

i used to using this extension with my old laptop. but now it's not working properly with my Macbook Air M1 + Thunderbird 91 version. Always disable after restarting TB

This review is for a previous version of the add-on (3.7). 

Dear Fauzi, could you raise a bug on the official issue tracker? unfortunately I don't have a Mac to test.
https://github.com/RealRaven2000/SmartTemplate4/issues