Examine source code of Talk-Theatre

{
  "description": "Přidá theatre režim na TalkTV.cz",
  "manifest_version": 2,
  "name": "Talk-Theatre",
  "version": "1.0",
  "homepage_url": "https://github.com/Desktop31/talk-theatre",
  "icons": {
    "48": "icons/icon-48.png",
    "512": "icons/icon-512.png"
  },
  "background": {
    "scripts": [
      "theatre.js"
    ]
  },
  "page_action": {
    "default_icon": "icons/off.svg",
    "browser_style": true
  },
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e780331a-de00-4fb2-bc44-4c61d9ddccd7}"
    }
  }
}