When logging into Micro OS Gnome RC after creating a user the 'First Boot'
script runs [/usr/bin/mod-firstboot] and attempts to install
org.mozilla.firefox. However this always fails on aarch64 as Mozilla only
provides an x86_64 package of the Firefox flatpak. This results in the
mod-firstboot script failing with an error on every login. This also results in
a broken environment as the rest of mod-firstboot fails to run.

I don't know a lot about Micro OS but would suggest improving mod-firstboot in
the following ways.

1) Install Firefox last and not first. This will allow the other components to
successfully install even if the Firefox flatpack fails.
2) For AARCH64 default to installing a different brower, the
org.chromium.Chromium flatpak is working well for me on AARCH64.

Or even better help/convince/persuade Mozilla to address
* https://bugzilla.mozilla.org/show_bug.cgi?id=1646462
* https://bugzilla.mozilla.org/show_bug.cgi?id=1677963