Hi Catacombs. I just recently got rid of Firefox and replaced it with Mullvad on all my Debian Qubes. Here is the official instructions from the mullvad site. Mullvad Browser for Linux
And her is an article in the forums with a few more steps. Mullvad Browser has released package repos for Debian and Fedora - #5 by tanky0u
There are issues with the disposable qubes that this article addresses. It might help you with the standalone. Hope this helps.
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