Rated 5 out of 5 stars

Enormously useful extension.
I've got so many urls bookmarked under folders named "12thSep2008", etc. , because I always have pages I want to read later and simultaneously keep out of my way.
Taboo saves your tabs elegantly, they've thought of everything.
The calendar view is especially useful.

This review is for a previous version of the add-on (0.5.6).