can't find profile after firefox restarted (on mac)

When I restarted firefox on my mac, it opened up a new window with no profile/bookmarks as if I was starting firefox for the first time. It doesn't have my old profiles. I suspect there's a "hidden" version of firefox someplace that does have my profiles, but I'm not opening the right version -- which is why it is opening as if I'm starting anew. My dock often shows two firefox icons, but there are not two firefox applications in my applications folder. The only one available on the dock right now is the one that opens a blank profile. And if I open firefox from the applications folder, it also opens a blank profile.