Examine source code of Container Website Blocker

{
  "manifest_version": 2,
  "name": "Container Website Blocker",
  "version": "1.0",
  "description": "Block specific websites within a chosen Firefox container.",
  "permissions": [
    "contextualIdentities",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "Container Blocker",
    "default_popup": "popup/popup.html"
  },
  "icons": {
    "48": "icons/icon.svg"
  },
  "content_security_policy": "script-src 'self'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "container-blocker@rsomonte.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "permissions": [
          "none"
        ]
      }
    }
  }
}