What is the difference between org.mozilla.firefox.BaseApp and org.mozilla.firefox on Flathub?

Question

Recently, I decided to try switching over from using system-installed applications to Flatpaks from Flathub. When installing Firefox, I was given the following option:

Similar refs found for ‘firefox’ in remote ‘flathub’ (system):

   1) app/org.mozilla.firefox.BaseApp/x86_64/20.08
   2) app/org.mozilla.firefox/x86_64/stable

Which do you want to use (0 to abort)? [0-2]:

I don't understand what the difference between these are, so unsure which to pick, and therefore my question is as follows: What is the difference between the Firefox suffixed with BaseApp and the one not suffixed with BaseApp from Flathub?

Answer 1

Pick the second one (org.mozilla.firefox), org.mozilla.firefox.BaseApp is some build dependency of Firefox (from flathub/org.mozilla.firefox.BaseApp: This is a build dependency of Firefox and not the app itself. You want to install org.mozilla.firefox instead.).

It's usually better idea to use the full "path" when installing a flatpak, so for Firefox you should use flatpak install flathub org.mozilla.firefox (see Firefox flathub page for more details).