I'm not a Mac guy. But there are a couple options I can think of; though neither one is very elegant.
One way is to get a outboard (hardware) stereo compressor. Run the browser/music player audio through it. Set attack=0, threshold to -40 or so, release to 5 or 10 seconds, and ratio to at 10 or 20.
Feed a copy of your Reaper output to the sidechain input.
The other way is to do exactly the same thing f4om within Reaper, using a plugin. This would require routing your browser/music player audio into a spare track in Reaper. Like I said, not an elegant solution...
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