Examine source code of Request Blocker

{
  "manifest_version": 2,
  "name": "Request Blocker",
  "version": "1.0",
  "description": "Блокирует определённые запросы.",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "requestblocker@example.com",
      "strict_min_version": "60.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": [],
        "uses": [],
        "reports": []
      }
    }
  }
}