Examine source code of NoJS on Onion

{
  "manifest_version": 2,
  "name": "NoJS on Onion",
  "version": "1.0.1",
  "description": "Disables JavaScript on .onion domains",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*.onion/*",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4354d979-4893-40ed-adb6-8ea1a27cca19}"
    }
  }
}