Beautiful extension, unfortunately it keeps forgetting all of the custom/specific site list and colors after a few restarts, tried to only start the browser with admin previleges and got no results (Tried on both Firefox and Firefox developer edition, everything up to date from the date of this review, i have a few custom about:config's but only on the main Firefox app, so i guess theres nothing there that could be interfering).

EDIT: Going to test the new 2.4 extension version right now.