Examine source code of Wiki Dictionary

{
  "manifest_version": 2,
  "name": "Wiki Dictionary",
  "version": "1.1.2",
  "description": "Quickly view word definitions from Wiktionary by double-clicking. Supports Ctrl+Double Click option. Simple and Easy.",
  "permissions": [
    "activeTab",
    "storage",
    "https://en.wiktionary.org/*",
    "https://commons.wikimedia.org/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "popup.html",
    "popup.css"
  ],
  "icons": {
    "48": "icons/icon_48.png",
    "96": "icons/icon_96.png"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "wiki-dictionary-addon@gmail.com"
    }
  }
}