The reality is that I'm a tab hoarder, I just forget to close them.

some of them I want to keep for "reasons" so every once in a while I do some cleaning.

Firefox has now that beautiful feature that originated in Chrome where each window has a drop down (To right, a rotated "greater than" - or "smaller than" - symbol pointing down) that lists all the tabs ina window, and I can close them from there.

So, cleaning time just got slimmed down greatly :)