Free program "
Extra Keys Assigner 2" allows you to assign arbitrary keyboard key (in particular, media key) send a number of keyboard presses to an arbitrary window in the system (e.g., browser window).
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Accordingly, it can be sent to the browser window Firefox 4:
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first Ctrl+L (to move to the address bar),
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then the URL of the player, the down arrow, and Enter (to switch to the tab with zvukooperatorom: when smokeproducing open, then switching to its tab will be offered by Fayerfoks as the first in the dropdown from the address bar list in his URLу),
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then the necessary zvukooperatora shortcuts (corresponding to commands to Play or Pause),
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then Ctrl+Tab (to switch back to the previous tab that was active "in the inactive page of the player").