Examine source code of FocuScroll

{
  "name": "FocuScroll",
  "description": "__MSG_extDescription__",
  "version": "1.1.0",
  "icons": {
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "manifest_version": 3,
  "permissions": [
    "scripting",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "48": "icons/48.png",
      "128": "icons/128.png"
    }
  },
  "commands": {
    "_execute_action": {
      "description": "__MSG_actionDescription__"
    }
  },
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "FocuScroll@bootleq",
      "strict_min_version": "109.0"
    }
  }
}