Examine source code of Reddlimit

{
  "manifest_version": 2,
  "name": "Reddlimit",
  "version": "1.2.0",
  "description": "Limits Reddit for web to a single page.",
  "icons": {
    "48": "images/logo-icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "index.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b50ea5e6-4a2c-49c1-8da1-6f2f0fdbbaa8}"
    }
  }
}