Examine source code of Refer Deez Nuts

{
  "manifest_version": 2,
  "name": "Refer DZ",
  "version": "2.4",
  "description": "Attempts to replace query string tracking codes with \"deez_nuts\"",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "dz.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b0117acd-bc21-48d5-9e7a-928f256be66a}"
    }
  }
}