Install Plex for Linux:
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flatpak install flathub tv.plex.PlexDesktop


Source: https://flathub.org/apps/details/tv.plex.PlexDesktop
Date: February 2023

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Fix Plex app for Linux not being able to login:

When trying to sing in to the Plex for Linux app, it will open a blank page for Firefox no matter what.
To fix this problem, delete the Firefox shortcut from /usr/share/applications. This will allow Plex to successfully open the login page in Vivaldi.


Date: March 1st 2023.