Examine source code of Neontools

{
  "name": "Neontools",
  "description": "Extension for neontools.io - Online Marketing and Social Media Tools",
  "version": "0.1.2",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "jquery.js"
      ]
    }
  ],
  "permissions": [
    "activeTab"
  ],
  "manifest_version": 2,
  "icons": {
    "16": "icon_16.png",
    "32": "icon_32.png",
    "48": "icon_48.png",
    "128": "icon_128.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  }
}