Examine source code of Block Bot

{
  "manifest_version": 2,
  "name": "Block Bot",
  "version": "1.3",
  "description": "A simple utility to disable bots that distub you while accessing websites.",
  "icons": {
    "48": "icon.png",
    "96": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "content.css"
      ]
    }
  ]
}