Firefox doesn't seem to be a MPRIS "provider" Spec: https://www.freedesktop.org/wiki/Specifications/mpris-spec/ Relevant Firefox bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1353652 Seems people are currently implementing this. Some extra info: websites can share this info using the new Media Session API. Some resources: https://developer.mozilla.org/...


For Epiphany, you need to install the gstreamer1.0-libav package. sudo apt install gstreamer1.0-libav I don't known about Vivaldi, sorry.

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