Examine source code of DefineIt 67

{
  "manifest_version": 2,
  "name": "DefineIt",
  "short_name": "DefineIt",
  "version": "0.17",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./js/jquery.js",
        "./js/content.js",
        "./js/popup.js"
      ],
      "css": [
        "./css/styles.css",
        "./css/popup.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "./js/background.js"
    ]
  },
  "description": "Ever wondered what a word meant but was too lazy to look it up? No more! This extension makes it effortless to find its definition",
  "author": "Rhenier Kloppers",
  "browser_action": {
    "default_icon": "./icons/256.png",
    "default_title": "Live Alert",
    "default_popup": "./html/popup.html"
  },
  "web_accessible_resources": [
    "wordsarray.json",
    "html/spinner.html",
    "html/definitionPopup.html",
    "html/iconPopup.html",
    "icons/256.png"
  ],
  "permissions": [
    "file://*/*",
    "tabs",
    "activeTab",
    "https://od-api.oxforddictionaries.com/",
    "http://od-api.oxforddictionaries.com/",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{bd8e147a-c23a-4849-bb83-741cf846b60f}"
    }
  }
}