Examine source code of 9gag Wizard

{
  "manifest_version": 2,
  "name": "9gag Wizard",
  "description": "Enrich your 9gag experience!",
  "version": "1.0",
  "content_scripts": [
    {
      "matches": [
        "*://9gag.com/*"
      ],
      "js": [
        "content_script.js"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fc66ecbc-747f-4c27-91c9-d8523537ca57}",
      "strict_min_version": "109.0"
    }
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  }
}