Examine source code of Flip Video Extension

{
  "manifest_version": 2,
  "name": "Flip Video Extension",
  "version": "1.1",
  "description": "Flip any video on a webpage horizontally with a single click.",
  "icons": {
    "48": "icon.png"
  },
  "browser_action": {
    "default_icon": "icon.png",
    "default_title": "Flip Video Extension"
  },
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{93876874-b203-4530-9a2a-e415bbc55759}"
    }
  }
}