Alex, I started having a problem since Version 2019.1.23 Released Jan 23, 2019. The player doesn't start auto-playing when I go to any channel. Player opens but the stream is paused. I have to push "space" every time to make it start playing. Is there a solution to this?
Other than that everything's great.

The default player makes my computer heat up immediately, but I've had no issues at all with this player, it works great! The only thing I'd like is the ability to use it with VODs as well.

Wasnt having any problems until recently where it seems to log me out of chat while in it, i close out of it and im logged in, back in and im logged out again, and cant seem to watch it and be logged into chat.

Edit: Nvm figured it out myself, Privacy Badger was causing problems with it.

Fixed my stuttering on Firefox. Thank you so much. Set my simultaneous downloads to 3 under buffering.

Wonderful.
I've been using this addon for a long time.
If it stops working, it's because Twitch changed something.. Give the lone developer a day or 2 to fix things.
VERY consistent and dedicated dev here.
I love this addon

saved me from persistently black/ not loading videos for twitch live under firefox 63.0.1