Examine source code of GitHub Avatars

{
  "manifest_version": 2,
  "name": "GitHub Avatars",
  "version": "0.4",
  "description": "Increases the size of user avatars in GitHub issues",
  "permissions": [
    "https://github.com/*"
  ],
  "author": "Michal Skoula",
  "content_scripts": [
    {
      "matches": [
        "https://github.com/*"
      ],
      "css": [
        "styles.css"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{9f1f9038-dead-431f-8b77-b79a66bc1823}"
    }
  }
}