Examine source code of WebTyping

{
  "manifest_version": 2,
  "name": "WebTyping",
  "version": "1.0.2",
  "description": "Select text on any page and practice touch typing on it — MonkeyType-style, right inside the page.",
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "start-typing": {
      "suggested_key": {
        "default": "Alt+Shift+T"
      },
      "description": "Start typing practice on the selected text"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "webtyping@finnmccoll.dev",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    },
    "gecko_android": {
      "strict_min_version": "142.0"
    }
  }
}