UPDATE: Jeremy pointed out that what I need is not a plugin but an extension (and there is a difference!). If that changes anyone’s mind just drop me a note.
I’ve been sitting on the idea for a Firefox extension for a while now and I realize I just don’t have the time to do it. If you’re interested in helping me realize this extension I’ve set aside a nice shiny $50 for someone who wants to jump on it. Please email me for details if you’re interested (see contact page).