If you're used to the old Media Keys (versions before 2.0) you'll notice a few limitations with version 2: 1. The browser window must be active for media keys to be detected due to a Firefox limitation. 2. Only Play/Pause is supported due to a Firefox bug. 3. Pinned tabs get priority over all other tabs when pressing a media key. 4. macOS is not supported due to Firefox bug. Please find us on GitHub if you'd like to request features, post issues or contribute to the project. Supported Sites: youtube, pandora, spotify, bandcamp, google play, yandex, soundcloud, tidalhifi, deezer, plex, vk, subsonic/madsonic, jamstash, overcast.fm, music.amazon.co.uk, music.amazon.com, di.fm, netflix.com, and tunein.com, stitcher.com.