I rely on ThreeStyleTabs Firefox extension....... you finish to have everything grouped/indented deeply depending on your navigation path.

Wow, that’s even more than my 1200 (1500 record) tabs!!

I don’t want to make the one saying “Mine is bigger”.... but going through the comments I’m starting to feel somewhat SICK: reading 1267 on the number of tabs loaded in my Firefox instance (with 2/3 extensions to save RAM)..... :-|