Examine source code of Netflix Playback Enhance

{
  "manifest_version": 2,
  "name": "Netflix Playback Enhancer",
  "version": "1.0",
  "description": "Manually set the highest bitrate for better video quality on Netflix.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4204d0dc-5546-45b1-b563-1defc785b76f}"
    }
  }
}