Examine source code of Retain me not

{
  "manifest_version": 2,
  "name": "Retain me not",
  "description": "Free your FFXIV inventory up",
  "version": "1.5.2",
  "icons": {
    "128": "icon.png"
  },
  "author": "Giuliano Riccio",
  "browser_action": {
    "default_icon": "icon.png"
  },
  "minimum_chrome_version": "45",
  "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "options_page": "options.html",
  "background": {
    "scripts": [
      "jquery.js",
      "background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.finalfantasyxiv.com/lodestone/character/*/retainer/*/baggage/"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "jquery.js",
        "sanitizer.js",
        "content.js"
      ]
    }
  ],
  "permissions": [
    "storage",
    "unlimitedStorage",
    "https://retainmenot.ffxivaddons.com/*"
  ]
}