I followed the instructions to install flatpak and then firefox (from the Mozilla pages) and got to the end, but Firefox was not not the path. There was a shell script in/home/edg/.local/share/flatpak/app/org.mozilla.firefox/x86_64/stable/869b4e0279ab4475432b2930ae5d583b7a0e00bac1078b8848d163820a152fa5/files/bin/firefox but it led to /app/lib/firefox/firefox. The /app directory doesn't exist.

Not sure what is wrong.