Plex via Firefox can't see Chromecast

I use Firefox (regularly updated) on Windows 10 and Ubuntu 23.04. Neither pc can see my two chromecasts. My iPhone and iPad using the plex app works fine with chromecast. I installed the Plex desktop app on my Ubuntu machine and it could not see Chromecast either. I know this worked earlier this year. Anyone else having this issue and/or found a solution? Thanks!

Plex DocumentationCasting, Flinging, & Remote ControlSupported Plex Companion Apps

Casting to Chromecast is available only via Android (mobile), iOS, or the Plex Web App (using Chrome browser).

Plex DocsChromecastCast from Browser or Desktop

Google does not support casting from other browsers besides Chrome.

Thanks. I must be confused with watching content directly on the pc vs casting, as I don’t cast very often.

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