Examine source code of Teddit Redirect

{
  "manifest_version": 2,
  "version": "1.2.0",
  "name": "Teddit Redirect",
  "description": "Redirect from Reddit to teddit automagically",
  "homepage_url": "https://github.com/simon1573/teddit-redirect",
  "icons": {
    "240": "icons/redirect-240.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{fabaca19-4136-44b4-885d-9244adc75826}"
    }
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*"
      ],
      "js": [
        "teddit-redirect.js"
      ],
      "run_at": "document_start"
    }
  ],
  "options_ui": {
    "page": "options.html"
  }
}