Hi and sorry for late answer, I was in vacation for a few day. Normally you should be able to install it on Firefox but SteemPlus is natively for Chrome and Opera so a few features won t work.
Concerning the AMO issue, did you get over it? Works fine on my end.
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Yes I solved it. I thought I had allowed all scripts, but my scriptblocker blocked one last thing, that prevented me from being able to sign up. Everything is working now.
Done... passionate developers is what we need here. Keep up the good work ;-)
Thanks a lot! And glad to see you solved that problem!