Examine source code of Web Link Shortener

{
  "manifest_version": 2,
  "name": "Web Link Shortener",
  "description": "Easy and Fast Web Link Shortener by mwh.link",
  "version": "1.0.0",
  "icons": {
    "16": "logo/favicon-16x16.png",
    "32": "logo/favicon-32x32.png"
  },
  "browser_action": {
    "default_title": "Web Link Shortener",
    "default_popup": "popup/popup.html"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "tabs",
    "contextMenus",
    "*://*/*",
    "storage"
  ],
  "background": {
    "scripts": [
      "script.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{660e0948-bdea-4478-b0ee-ce345a0f60ee}"
    }
  }
}