I don't want to piss on the OP effort, some people will find it useful. For me, I don't understand the problem. Why do so many people need a tab manager in say Firefox, but not in Word, Excel, Windows Explorer or Total Commander?
Because they rarely open so many tabs there? I routinely open dozens of tabs in web browsers as I navigate to other pages wanting to keep the previous while I explore the web (I hardly ever left-click links - I almost always wheel-click) but I rarely ever open more than 6 folders in Total Commander or more than 6 documents in an Office.