I built this extension using Chickenfoot, which hit version 1.0 recently. Part of that release included improvements to the extension-packaging tool, which made it much easier for me to convert my iGoogleBar prototype into a full-fledged Firefox extension!
The iGoogleBar page acknowledges that there are some missing features from the extension, so I put the source code in the Chickenfoot Scripts Wiki. That means, if you’d like to see a new feature added, please go and update the Wiki instead of just nagging me :) If I like your patch, then I’ll make a new release. And if I don’t like your patch, then you can at least install your modified version of iGoogleBar as a trigger in Chickenfoot.
Will this method of software development actually work? Probably not, but it should be fun to try!