Does not work with TB 24.0, but now it does ! Rated 5 out of 5 stars
It is a good add-on and was working fine while on TB 17.x Upgraded to 24.0 today and now every email show with (>) even for the ones that are sent directly to me and should be shown with (>>) instead. Anyone know how to fix this, would be greatly appreciated.
Update: Sept 19: After I wrote the review, the add-on developer updated to fix this issue for for TB 24.0. Great Job and Thank You for quickly fixing it.
Fix will be available shortly
I just uploaded version 0.6, which fixes the problem you describe. It will probably take a while until it will have been reviewed by the AMO team. Meanwhile, you may want to download a pre-release from https://dl.dropboxusercontent.com/u/1526797/tb-personal-level-indicator-0.6.xpi.