I've been using Epiphany for a couple of days, but have encountered a problem with Google Voice that I think Firefox would "solve." Instead of downloading on my own, I dutifully used the AppCenter, so that elementary would "know" that I have installed the app. Now Mozilla Firefox is on my list of installed applications but I cannot open it via AppCenter, and cannot locate it via Files. (Searched for "Mozilla" "Firefox" and ".tar")
I feel like I've "played by the rules," and that didn't work. I'd love suggestions for elementary actions that could move me forward (and perhaps teach me something about elementary). Should I uninstall, and then reinstall Firefox through AppCenter, and why would that work when it didn't initially?
I'm embarrassed to write that I solved my problem, and didn't document it. My guess, though, is that I went back to the Applications drop down, and saw Firefox "all of a sudden."
Thank you - I appreciate both answers I received, and (as I explained) didn't want to immediately go to Terminal and start using the power of the command line, so as to give elementaryOS a chance to stay well-integrated.