Examine source code of Bandcamp Fast Play

{
  "manifest_version": 2,
  "name": "bcFastPlay",
  "version": "1.2resigned1",
  "description": "Just hit space-f******g-bar to Pause / Play, how useful is that ?",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.bandcamp.com/*"
      ],
      "js": [
        "bcFastPlay.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7c29b7e0-3a30-4646-a154-a8741004981c}"
    }
  }
}