In Windows, when you hit alt-tab, you can browse through open windows. I recall, at one point, there was a similar add-on for Firefox where you could hit a keyboard shortcut and, just like the windows feature, a small window would pop-up where you could view all the open tabs and also navigate and select.
I know I can use ctrl+tab or cmd+(1 through 9), but when I have too many tabs, it's very painful to cycle through all those tabs.
I've done an lengthy search but can't find anything. Does anyone happen to know of this add-on or a similar add-on?