Examine source code of Pure URL

{
  "name": "Pure URL",
  "version": "1.3.1resigned1",
  "description": "Removes garbage like \"utm_source\" from URLs",
  "author": "Evgeny Vrublevsky",
  "homepage_url": "http://veg.by/",
  "icons": {
    "48": "icon48.png"
  },
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "pure-url@jetpack"
    }
  }
}