This is A must have plugin for every one, it's more piratical to put the tabs on the side and use the screen real estate to display more content. And for any one which to work with many tabs to have a clue for which tab came from which page and how the tab's are related.

Thanks you @Piro for this great and essential extension. I did worry from the transition to WebExt that this extension will vanish, and start looking on Vivaldi browser which have similar option but a more limited options compared to this extension.

Looking forward for Mozilla to extend the API to allow more control on the browser.

Thanks again.