ASGARD-1174 - Init screen on Firefox should not do infinite redirects

It also should not show the loading screen when the administrator still hasn't configured Asgard yet.

Instead, Firefox should immediately show the message about why Firefox is currently incompatible.
Merge pull request #327 from joesondow/ASGARD-1174-Init-Firefox

ASGARD-1174 - Init screen on Firefox should not do infinite redirects