Examine source code of Custom CORS Control

{
  "applications": {
    "gecko": {
      "id": "custom-cors-control@tartpvule.localhost",
      "strict_min_version": "57.0"
    }
  },
  "author": "tartpvule",
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "description": "Advanced user control for CORS",
  "manifest_version": 2,
  "name": "Custom CORS Control",
  "options_ui": {
    "browser_style": true,
    "page": "options.html"
  },
  "permissions": [
    "<all_urls>",
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],
  "short_name": "CCC",
  "version": "0.2"
}