Add-ons • Re: Working on a Greasemonkey fork for Pale Moon

nobody in the addons team care for it to replace Janek's fork

That's not how it works - you have to submit your new addon for review before it can be added there, fork of an existing one or not. There's been others who were leery of hosting their extensions on the PM addons site and prefer to release their extensions on their own so it's best to formally create a thread about it on the addons board which can also be used later for new release announcements.