Examine source code of Domain Redirector

{
  "manifest_version": 2,
  "name": "Domain Redirector",
  "version": "1.0",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "storage",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{326e1082-cb4b-4450-83b1-d03e93b0d9f2}"
    }
  }
}