Please use vertical tabs Rated 4 out of 5 stars

To the developer:
You should add vertical tabs. there are thousands of of Tab Kit users ( https://addons.mozilla.org/en-US/firefox/addon/tab-kit/ ) who would adopt to it.

This review is for a previous version of the add-on (1.1.1-signed).  This user has 3 previous reviews of this add-on.