Rated 2 out of 5 stars

It could be so good, but unfortunately the table for text replacements is often not saved, but more importantly, *it causes TB to be sluggish as hell*! 3 second delays when entering a recipient... Please fix! Or publish the source code, so I can fix it myself.

This review is for a previous version of the add-on (1.5.7). 

originally, the dictionary was loaded at each opening a message compose.
It is now opened at the first message compose after install or choosing a language and then stored in TB