Add Compatibility for Pluto.tv streaming

[Scorp]

Is your feature request related to a problem? Please describe.
No

Describe the solution you'd like
Compatibility with Pluto TV => https://pluto.tv

Describe alternatives you've considered
Firefox PiP, but prefer MPV usage.

Additional context
None.

[William Woodruff]

ff2mpv is a Firefox extension that wraps MPV, which in turn wraps youtube-dl for actual stream extraction.

You'll need to file this report with them: https://github.com/ytdl-org/youtube-dl/issues/new/choose