Examine source code of UserCSP

{
  "applications": {
    "gecko": {
      "id": "{1809716c-a7ab-47c5-9544-7ff22c13da5c}"
    }
  },
  "description": "User-defined Content Security Policy",
  "manifest_version": 2,
  "name": "UserCSP",
  "version": "1.1resigned1",
  "permissions": [
    "<all_urls>",
    "storage",
    "webRequest",
    "webRequestBlocking"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}