Review for EarlyBlue by Tony Mechelynck
Rated 5 out of 5 stars
Subdued, economical of chrome real estate, and regularly maintained (the latter is getting rare these days): I love it. (And for whoever likes "flashy" rather than "subdued" there is also "LCARSTrek", by the same author.)
This review is for a previous version of the add-on (2.38).To create your own collections, you must have a Mozilla Add-ons account.