This add-on serves as a long-awaited solution for tab management in Firefox Quantum. It includes the essential overview of tabs (including separation of multiple Firefox windows, if applicable). It also features two clever and highly useful components: a search bar and thumbnail previews of each tab, on hover). Clicked tabs focus into view while retaining the Tabby menu, which allows for easy navigation with the absolute minimum of clicks and distractions. This is a smart and simple tool. It has made me forget Tab Groups and is, by far, the best of the available tab manager add-ons. It does what is needed, contains components that are useful, and adds nothing else. It is difficult to think of anything that could be added to improve it. My only recommendation would be to keep it as-is. Its simplicity and lack of bloat sets Tabby apart from the rest. Outstanding!

Excellent extension!!
Shortcuts to toggle between windows would make it perfect :)