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gnome-shell-extension-mpris-indicator-button
A full featured MPRIS indicator button extension for GNOME Shell 3.38+
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🎧 mpris media player command-line controller for vlc, mpv, RhythmBox, web browsers, cmus, mpd, spotify and others.
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Since Waterfox is based on Firefox and the MPRIS implementation of the latter seems optimal I suppose something is "missing"(?) in Waterfox sourcecode, I use the "MPRIS Indicator Button" GNOME shell extension and it's always worked flawlessly with Firefox but it never did with Waterfox .
According to the playerctl CLI utility Waterfox doesn't "show" any MPRIS interface (playerctl -l doesn't return any player while Waterfox is playing anything from Youtube or Spotify), so I'd say the problem is not caused by the desktop environment nor the GNOME shell extension I use.