Examine source code of Nipple remote

{
  "manifest_version": 2,
  "name": "Nipple remote",
  "version": "1.1",
  "description": "An extension for controlling videos on your browser remotely",
  "browser_action": {
    "default_icon": "icons/nipple.png",
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "48": "icons/nipple.png"
  },
  "permissions": [
    "*://*.netflix.com/*"
  ],
  "background": {
    "page": "pages/background.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c41087c4-ead3-433d-aabf-e045df0bd7ce}"
    }
  }
}