Examine source code of RaspberryCast

{
  "background": {
    "scripts": [
      "js/jquery-3.3.1.min.js",
      "js/background.js",
      "js/popup.js"
    ]
  },
  "browser_action": {
    "default_icon": "20.png",
    "default_title": "RasperryCast remote",
    "default_popup": "popup.html"
  },
  "description": "Share videos to Rpi",
  "icons": {
    "16": "16.png",
    "48": "48.png",
    "128": "128.png"
  },
  "options_ui": {
    "page": "options.html"
  },
  "manifest_version": 2,
  "name": "RaspberryCast",
  "permissions": [
    "contextMenus",
    "tabs",
    "notifications"
  ],
  "version": "1.4.1resigned1",
  "browser_specific_settings": {
    "gecko": {
      "id": "@raspberrycast"
    }
  }
}