Examine source code of robots.txt Viewer

{
  "manifest_version": 2,
  "name": "Robots",
  "version": "1.0",
  "description": "Shows the robots.txt content of the current webpage.",
  "homepage_url": "https://github.com/philippG777/Robots-WebExtension",
  "permissions": [
    "activeTab",
    "<all_urls>"
  ],
  "icons": {
    "512": "icons/robot.png"
  },
  "browser_action": {
    "default_icon": "icons/robot_small.png",
    "default_title": "Robots",
    "default_popup": "popup/index.html"
  }
}