Examine source code of Avoid redditmedia

{
  "manifest_version": 2,
  "name": "Avoid redditmedia",
  "version": "1.0",
  "description": "Automatically redirects redditmedia.com links to reddit.com.",
  "icons": {
    "48": "icons/icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.redditmedia.com/*"
      ],
      "js": [
        "redirect.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3a4e45c3-e36b-474e-a9b5-ba90857bc91b}"
    }
  }
}