MMS is still being worked on:
That is an issue with GNOME Software on Debian based installs,
firefox-esr shows as the old
From the command line install the packages:
firefox-esr-mobile-config the last one includes tweaks to make firefox fit better in a mobile screen.
At the moment we are missing an image viewer that is adaptive.
File manager: you can install nautilus (which is not adaptive yet) and scale it to fit the screen, not the same as adaptive, but it helps. To do that, download this script: https://source.puri.sm/Librem5/phoc/-/blob/master/helpers/scale-to-fit
And from the directory where the script is run:
scale-to-fit org.gnome.nautilus on and it should look like this:
If you want to take screenshots, you can install from the command line the package:
librem5-goodies it contains the application that @Kyle_Rankin made to take screenshots. After install it will show in the app tray as: