Examine source code of LionEXT by D.M.

{
  "name": "LionEXT by D.M.",
  "short_name": "LionEXT",
  "description": "Adds additional features in google pages to make easier the daily work of the SEO Consultant.",
  "author": "Dimitar Marinov",
  "version": "2.4resigned1",
  "manifest_version": 2,
  "homepage_url": "http://lionext.dmarinovdev.com",
  "icons": {
    "16": "img/icon16.png",
    "48": "img/icon48.png",
    "128": "img/icon128.png"
  },
  "browser_action": {
    "default_icon": {
      "19": "img/icon19.png",
      "38": "img/icon38.png"
    },
    "default_title": "LionEXT v2.0",
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "js": [
        "js/contentscript.js",
        "js/script-func.js"
      ],
      "matches": [
        "https://*.google.com/*",
        "http://*.google.com/*",
        "http://*.google.bg/*",
        "https://*.google.bg/*",
        "http://*.google.co.uk/*",
        "https://*.google.co.uk/*",
        "http://*.google.au/*",
        "https://*.google.au/*",
        "http://*.google.ca/*",
        "https://*.google.ca/*"
      ]
    }
  ],
  "web_accessible_resources": [
    "css/styles.css",
    "css/lcl-order.css",
    "img/gmb-verified-30px.png",
    "img/gmb-not-verified-30px.png",
    "img/pins-sprite.png"
  ],
  "options_ui": {
    "chrome_style": true,
    "page": "options.html"
  },
  "permissions": [
    "tabs",
    "activeTab",
    "storage",
    "http://*.google.com/",
    "https://*.google.com/",
    "http://*.google.bg/",
    "https://*.google.bg/",
    "http://*.google.co.uk/",
    "https://*.google.co.uk/",
    "http://*.google.au/",
    "https://*.google.au/",
    "http://*.google.ca/",
    "https://*.google.ca/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "@lionextdm"
    }
  }
}