Examine source code of WebsiteOutlook

{
  "description": "Display website value and stats",
  "manifest_version": 2,
  "name": "WebsiteOutlook",
  "version": "1.0",
  "homepage_url": "https://www.websiteoutlook.com",
  "icons": {
    "48": "icons/icon-48.png"
  },
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_icon": "icons/icon-32.png",
    "default_title": "WebsiteOutlook",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "info@websiteoutlook.com"
    }
  }
}