Offer installation steps for Fedora Silverblue and Kiniote

[jermanuts]

Does this feature already exist in Firefox Stable?

I'm not sure

Does this feature already exist in Firefox ESR?

I don't know

Feature description

Offer installation steps for Fedora Silverblue and Kiniote at https://mullvad.net/en/download/browser/linux in Fedora commands.

Alternatives considered

No response

Is this related to a problem?

No response

[jermanuts]

curl --tlsv1.3 -fsS https://repository.mullvad.net/rpm/stable/mullvad.repo | sudo tee /etc/yum.repos.d/mullvad.repo

rpm-ostree install mullvad-browser

Worked great. Was shared here https://discussion.fedoraproject.org/t/howto-install-mullvadvpn-browser-on-fedora-atomic-desktops/125749