Examine source code of Page JavaScript Toggle

{
  "manifest_version": 2,
  "name": "Page JavaScript Toggle",
  "version": "1.0.0",
  "description": "Toolbar / Tools-menu toggle that blocks scripts on websites (CSP script-src 'none'). Standard extensions cannot set about:config javascript.enabled; this matches its effect for web pages.",
  "browser_specific_settings": {
    "gecko": {
      "id": "page-js-toggle@local.dev",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "menus",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "page": "background.html"
  },
  "browser_action": {
    "default_title": "Page JavaScript: allowed",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png"
    }
  },
  "commands": {
    "toggle-page-js": {
      "suggested_key": {
        "default": "Alt+Shift+J"
      },
      "description": "Toggle page JavaScript blocking"
    }
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  }
}