Examine source code of Docs Highlight Shortcut

{
  "manifest_version": 2,
  "name": "Docs Highlight Shortcut",
  "version": "1.2",
  "description": "Adds a hotkey to highlight text in Google Docs.",
  "icons": {
    "48": "icons/48.png",
    "96": "icons/96.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://docs.google.com/document/d/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "commands": {
    "toggle-highlight": {
      "suggested_key": {
        "default": "Ctrl+Alt+H",
        "mac": "Ctrl+Shift+H"
      },
      "description": "Highlight text"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "docs-highlight-shortcut@austish",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}