Rated 5 out of 5 stars

Works well! It is very handy!
I really like the idea and implementation.
Please add an option to change not only color of the messages but also a highlight color (preferably light pastel). Different font colors are not easy to see, but highlight colors are great for that purpose.

UPDATE: Current version of Tag Toolbar 0.7.80 was not compatible (ON MY COMPUTER) with the current version of Thunderbird 2.0.0.18 and SYNCMAB addon. I removed SYNCMAB and things started working fine.

Please consider my feature request to add highlight (background) colors.

Also it would be nice to have separate buttons for custom tag filters. For example a button in the tool bar that would filter out all untagged messages or leave only messages which are tagged Important.

This review is for a previous version of the add-on (0.7.80).