Examine source code of URLColors

{
  "name": "URLColors",
  "short_name": "URLColors",
  "description": "A chrome extension that adds a colored border around websites that match user inputted preferences.",
  "version": "1.1.2",
  "permissions": [
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "URLColors",
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{74836a75-6f46-483d-8a50-c56f213c6492}"
    }
  }
}