Examine source code of Block proxy

{
  "manifest_version": 2,
  "name": "Proxy-blocker",
  "description": "Uses the proxy API to block requests to specific hosts.",
  "version": "1.0.0",
  "icons": {
    "48": "icons/block.svg",
    "96": "icons/block.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "91.1.0",
      "id": "{0f0e6b81-d95b-456f-bfd4-3d79b4655828}"
    }
  },
  "background": {
    "scripts": [
      "background/proxy-handler.js"
    ]
  },
  "options_ui": {
    "page": "options/options.html",
    "browser_style": true
  },
  "permissions": [
    "proxy",
    "storage",
    "<all_urls>"
  ]
}