Mutes streaming radio

I listen to web-based streaming radios (e.g. Streema) on Mozilla, and when I start up MuseScore2 it mutes the browser audio (although the audio icon in the browser tab doesn't show it muted). I can stop and restart the streaming music and it then works (doesn't fix things if I mute then unmute the brower tab), but I would prefer for this not to happen. It doesn't happen with other applications.