Examine source code of snoot

{
  "description": "Redirect new reddit links to old reddit.",
  "manifest_version": 2,
  "name": "snoot",
  "version": "1.1.0",
  "homepage_url": "https://github.com/ranguli/snoot",
  "icons": {
    "48": "icons/snoot-48-light.png",
    "96": "icons/snoot-96-light.png"
  },
  "browser_action": {
    "browser_style": true,
    "theme_icons": [
      {
        "light": "icons/snoot-48-dark.png",
        "dark": "icons/snoot-48-light.png",
        "size": 48
      },
      {
        "light": "icons/snoot-96-dark.png",
        "dark": "icons/snoot-96-light.png",
        "size": 96
      }
    ],
    "default_icon": {
      "48": "icons/snoot-48-light.png",
      "96": "icons/snoot-96-light.png"
    },
    "default_title": "we did it reddit",
    "default_popup": "popup/snoot.html"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "https://www.reddit.com/",
    "https://new.reddit.com/"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://old.reddit.com/*"
      ],
      "js": [
        "simplify.js"
      ]
    }
  ]
}