Rated 5 out of 5 stars

Wonderful addition to T-Bird.

One suggestion: add an option (attached to the highlight) to bold text and change the text color to White, i.e. clicking on the "Mark" changes text and adds highlight. A darker Textmarker color hides the normal text -- I like Red with bold white text.

This review is for a previous version of the add-on (5.1.0).