Rated 5 out of 5 stars
Although marked as not compatible with nightly builds (V4.03bpre) it does work, along with Addon Compatibility Reporter. Firefox has now added searching for open Tabs, but guess what - I still prefer using Tabhunter to find a tab.
Also use Bartab to silence inactive tabs, so now usually have over 200 tabs open. This is a Terrific Addon. I only have these 3 - Addon Compability Reporter, Bartab and Tabhunter.