Examine source code of Page Redder pro

{
  "name": "Page Redder pro",
  "description": "Make the current page red",
  "version": "2.0",
  "permissions": [
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_title": "Make this page red"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{36daf34f-421a-427f-a387-8c7dcd54f451}"
    }
  }
}