Hissing noise when using headphones

I'm relatively new to the PBP, having received it only a few days ago, and I have a problem:

Whenever I playback any video or audio on Firefox or Chromium and listen via my headphones I can hear a strange hissing noise that stops whenever I stop the playback. Also, in Firefox, the audio only plays back if the local volume setting (that is within e.g. the video player) is at its maximum. Am I doing something wrong?

I'd like to thank for your help in advance!

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