Examine source code of ShoulderTap

{
  "manifest_version": 2,
  "name": "ShoulderTap",
  "version": "1.0.1",
  "description": "Extension that makes ShoulderTap accessible on your Google Search Results page.",
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "https://www.google.com/*"
      ]
    }
  ],
  "icons": {
    "128": "icon128.png"
  },
  "browser_action": {
    "default_icon": "icon128.png",
    "default_popup": "popup.html",
    "default_title": "My custom google Extension"
  }
}