I should sleep at night: I have a running Nvu 0.50+ based on Firefox 1.0 sourceball with perfectly working extensions/themes manager. So if you plan to extend Nvu for your own needs or just for fun, get ready, the time has come... I still have a few things to fix/remove/modify: the download manager for instance makes no sense in Nvu but I get it automatically from an overlay; the profile switcher may also be out of scope, we'll see; and the contributed Help viewer just stopped working with that build.

Oh, and the Nvu mirror at glazman.org/nvu/releases is back. For the moment.