Install older versions

#1

If I install an app like a browser and the latest update version does not work can I install or fall back to an older version ?

#2 
flatpak remote-info --log flathub org.gnome.gedit
sudo flatpak update --commit=961eb64d42264cbb347acb33650bfa98d8ccdf0d69a4a6f72f328e2455f335be org.gnome.gedit
#3

What is those command suppose to do

#4

Install older versions? This is an example. I installed version 44.1 of org.gnome.gedit. The current version is 44.2.

#5

How do you know the older version. for example Firefox I do not see a older version.

#6

I can see older commits of Firefox. You have to try the commits. I like the OSTree under the hood of Flatpak:
https://docs.flatpak.org/en/latest/under-the-hood.html