Your comments

It's been yet another two years, and six total, of course... And we still appreciate your work that went into this extension, and would like to see it on Github (ideally with a "donate" button, as suggested earlier).  I don't think there are any obscure build tools out there that would prevent people from being happy at this point with *something* official.

That said, considering the stated intent to open source and the lack of movement, perhaps we can consider this extension to be open-source already as far as its license goes, per the developer?  It being a Chrome extension, the source is pretty much embedded in it and can be extracted easily enough.  Someone could just put it on Github themselves at that point, I suppose.