My list of Firefox add-ons

UPDATE (27 Feb 2010) BarTab is an awesome extension.

Other potentially useful that I haven't installed:

Longevity by Uplift

Think a long life has to come with losing your mind or your body? Think again! Age is strength. 💪 Mind & body movers for how to live a long, healthy and balanced life on your own terms.

Get a few carefully curated articles once a month. Here's a sample.