Examine source code of Magnegetter

{
  "manifest_version": 2,
  "name": "Magnegetter",
  "version": "1.0",
  "description": "Get all magnet links from the present page",
  "icons": {
    "48": "imgs/favicon.png"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "imgs/favicon.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{249199be-048e-4702-b2dd-df1177a5b6cf}"
    }
  }
}