Players I am using, that aren't supported yet:

version: 2.3.4
lin_mpris: firefox.instance_1_579 - Mozilla zen-twilight (disabled)
lin_mpris: chromium - FreeTube (disabled)
signature: 493750e53aeb5ad9

Hello there! I wanted to ask for support for the FOSS Youtube client, FreeTube.
On another note, thank you for quickly adding support for the player I had previously requested too, awesome work! :D