Examine source code of syp-audio

{
  "description": "SYP audio downloader",
  "manifest_version": 2,
  "name": "syp-audio",
  "version": "2.0",
  "permissions": [
    "webRequest",
    "<all_urls>",
    "downloads"
  ],
  "icons": {
    "48": "icons/volume-48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.satyamyogaprasad.net/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{cd2c758f-973a-4218-9712-6377c691706d}"
    }
  }
}