Like OneTab but leaner and FOSS. Named "Tabulator".
It started out with the idea of being a OneTab clone where I would release the source code but immediately I found stuff I could do better and lighter than OneTab. For example OneTab runs constantly, while this runs only when it's called or the tab groups page is displayed. (Event pages [this] vs. persistent background page [OneTab].)
Currently it is near to completion but still in development, stuff might break.
I am not yet going to provide usage or installation instructions as this is not yet ready for use, and at this point if you want to use it you really should be the kind of user who knows how to do this already. :)
A screenshot of the semi-current progress:
This project is licensed under the permissive ISC license. You
can find the license information in this project in the LICENSE file.