Examine source code of Follows You GitHub

{
  "manifest_version": 2,
  "name": "Follows You GitHub",
  "version": "1.0.0",
  "description": "Adds a \"follows you\" label on a GitHub follower profile or hovercard",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "https://api.github.com/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*",
        "https://gist.github.com/*"
      ],
      "js": [
        "follows-you.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7d461a78-b159-4500-a3fd-1ed9b250991f}"
    }
  }
}