Examine source code of SoundCloud EQ

{
  "manifest_version": 2,
  "name": "SoundCloud EQ",
  "version": "4.5",
  "description": "10-band equalizer for SoundCloud",
  "permissions": [
    "*://soundcloud.com/*"
  ],
  "web_accessible_resources": [
    "eq-page.js"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://soundcloud.com/*"
      ],
      "js": [
        "eq.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "soundcloud-eq@local"
    }
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  }
}