It is running on the phone. It's the Firefox that was installed when I got the phone. It seems to be the Linux Firefox based on my previous phone. F-droid doesn't seem to have a FIrefox app but I did find Firefox mobile in Aurora.
I gather the issue that I should be using Firefox Mobile for Android apps?
OK. Found the issue. There is a hidden browser called "browser" that was the default for Android apps. It's not on the main panel but I found it in the Android Installed Apps. I removed it and installed Firefox Mobile. It's working now.