Examine source code of StackTop

{
  "name": "StackTop",
  "description": "StackTop preloads the accepted/top-voted StackOverflow answers into your google search results!",
  "version": "1.3.0",
  "manifest_version": 2,
  "content_scripts": [
    {
      "matches": [
        "https://www.google.com/search*"
      ],
      "js": [
        "google_handler.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "permissions": [
    "*://api.stackexchange.com/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "/images/logo16.png",
      "32": "/images/logo32.png",
      "48": "/images/logo48.png",
      "128": "/images/logo128.png"
    }
  },
  "icons": {
    "16": "/images/logo16.png",
    "32": "/images/logo32.png",
    "48": "/images/logo48.png",
    "128": "/images/logo128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5026bc52-2b19-41e8-abac-cf5f7cd86b68}"
    }
  }
}