Examine source code of Focus Arrow

{
  "name": "Focus Arrow",
  "version": "1.5.0",
  "description": "A customizable page blocker perfect for your needs.",
  "permissions": [
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "https://focusarrow.app/*"
  ],
  "background": {
    "scripts": [
      "background/bundle.js"
    ],
    "service_worker": "background/bundle.js",
    "type": "module"
  },
  "action": {
    "default_title": "Focus Arrow's settings",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "common/icons/Focus_Arrow_text-false_16.png",
      "32": "common/icons/Focus_Arrow_text-false_32.png",
      "48": "common/icons/Focus_Arrow_text-false_48.png",
      "128": "common/icons/Focus_Arrow_text-false_128.png"
    }
  },
  "icons": {
    "16": "common/icons/Focus_Arrow_text-false_16.png",
    "32": "common/icons/Focus_Arrow_text-false_32.png",
    "48": "common/icons/Focus_Arrow_text-false_48.png",
    "128": "common/icons/Focus_Arrow_text-false_128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a0e75bdb-3d83-4d1e-8c9b-9cba5fee6414}"
    }
  },
  "manifest_version": 3
}