Examine source code of Simply Redirect

{
  "manifest_version": 2,
  "name": "Simply Redirect",
  "version": "0.0.6",
  "description": "Simply redirect URLs as specified by a json data you choose.",
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "storage",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking"
  ],
  "options_ui": {
    "page": "config/options.html",
    "open_in_tab": false
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}