Examine source code of toktogi

{
  "manifest_version": 2,
  "name": "Toktogi: A Korean-English Popup Dictionary",
  "short_name": "Toktogi",
  "description": "Popup Korean-English dictionary that shows you the definitions of Korean words when you hover the mouse next to them",
  "version": "0.7.2resigned1",
  "minimum_chrome_version": "51",
  "author": "Brad McDermott",
  "permissions": [
    "http://*/*",
    "https://*/*",
    "unlimitedStorage",
    "tabs"
  ],
  "browser_action": {
    "default_icon": {
      "19": "images/19.png",
      "38": "images/38.png"
    },
    "default_popup": "popup.html"
  },
  "icons": {
    "16": "images/16.png",
    "48": "images/48.png",
    "128": "images/128.png"
  },
  "background": {
    "scripts": [
      "js/background-build.js"
    ]
  },
  "content_scripts": [
    {
      "all_frames": false,
      "js": [
        "js/vendor/jquery-3.2.1.min.js",
        "js/browser_tools.js",
        "js/inject.js"
      ],
      "css": [
        "css/inject.css"
      ],
      "matches": [
        "<all_urls>"
      ],
      "run_at": "document_end"
    }
  ],
  "web_accessible_resources": [
    "images/unlock.png",
    "images/lock.png",
    "images/plus.png"
  ],
  "options_ui": {
    "page": "popup.html"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "toktogi@toktogi.com"
    }
  }
}