No idea on that waxpost.
I didn't even know about Waterfox. I'm giving it a try now. Glad it makes use of the Firefox profile =)

Haha. Waxpost is an app that lets you post something once, and it will crosspost it to other sites- FA, DA, SF, etc.

Oh gosh, i need this. Let me know if you figure it out on firefox.

Ahh ... I heard of such an app before but maybe under a different name. *shrugs* =)

Love waterfox, but have you used Pale Moon? It runs much faster/smoother for me but unfortunately doesn't update often (so doesn't support a lot of addons I love). =( (I use both Pale Moon and Waterfox now, but mostly waterfox)

Anyway. Any addons that work for firefox will work on waterfox, so there's no need to distinguish it when looking for addons. This is the guy who created waxpost and he states he's not going to do a firefox version so we're out of luck.
I think the best bet is to get chrome, download waxpost for it, and then get an extension that allows you to open chrome inside firefox or to seamlessly switch to chrome while running firefox. There are some here.

Good luck.

Never herd of it before! Sounds awesome though. Good thing I use chrome. ;P