Examine source code of Tor2web redirect

{
  "manifest_version": 2,
  "name": "Tor2web redirect",
  "short_name": "Tor2web",
  "version": "0.1",
  "author": "Luc Everse",
  "homepage_url": "https://git.wukl.net/wukl/tor2web-redirect",
  "description": "Automatically redirects .onion sites to a Tor2web proxy.",
  "icons": {
    "48": "icons/tor2web.svg",
    "96": "icons/tor2web.svg"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.onion/*"
  ],
  "background": {
    "scripts": [
      "tor2web.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{3653a72f-e870-41f9-8e32-d9e43aef5bc8}"
    }
  }
}