Examine source code of Google Docs Equation Shortcut

{
  "manifest_version": 3,
  "name": "Google Docs Equation Shortcut",
  "version": "1.0",
  "description": "Adds a keyboard shortcut (default Ctrl+Alt+E) to trigger the Insert Equation editor in Google Docs.",
  "permissions": [
    "activeTab",
    "scripting"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "32": "icon.svg",
      "64": "icon.svg",
      "128": "icon.svg"
    }
  },
  "commands": {
    "trigger-equation": {
      "suggested_key": {
        "default": "Ctrl+Alt+E",
        "mac": "MacCtrl+Alt+E"
      },
      "description": "Trigger the Insert Equation menu in Google Docs"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://docs.google.com/document/*"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "gdocs-equation-shortcut@example.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "extensions": true,
        "required": [
          "none"
        ]
      }
    }
  }
}