Examine source code of Headripper

{
  "manifest_version": 2,
  "name": "Headripper",
  "version": "1.0.0",
  "description": "Download Headspace audio directly.",
  "permissions": [
    "*://*.cloudfront.net/*",
    "activeTab",
    "alarms",
    "downloads",
    "https://api.prod.headspace.com/*",
    "https://my.headspace.com/*",
    "https://www.headspace.com/*",
    "storage",
    "webRequest"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://my.headspace.com/*",
        "https://www.headspace.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_action": {
    "default_title": "Headripper"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "headripper@cheesiest.dev",
      "strict_min_version": "102.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}