Examine source code of More Split Views

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "default_locale": "en",
  "version": "0.1.1",
  "description": "__MSG_extensionDescription__",
  "browser_specific_settings": {
    "gecko": {
      "id": "more-split-views@local.dev",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage",
    "tabs"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "action": {
    "default_title": "More Split Views",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "48": "icons/icon.svg"
    }
  },
  "icons": {
    "48": "icons/icon.svg"
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "content/overlay.css"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Shift+Period"
      },
      "description": "Open More Split Views"
    }
  }
}