Examine source code of Simple Commands Extension

{
  "name": "Simple Command for Detach Attach Tabs",
  "description": "Press Alt+Shift+D to detach the tab to new window.",
  "homepage_url": "https://github.com/i5on9i/crazycmd",
  "manifest_version": 2,
  "version": "1.1.4",
  "browser_specific_settings": {
    "gecko": {
      "id": "coosal@duck.com"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "tabs"
  ],
  "commands": {
    "detach-and-resize-window": {
      "suggested_key": {
        "default": "Alt+Shift+W"
      },
      "description": "resize window"
    },
    "detach-to-window": {
      "suggested_key": {
        "default": "Alt+Shift+G"
      },
      "description": "Send a 'detach-to-window' event to the extension"
    },
    "merge-into-window": {
      "suggested_key": {
        "default": "Alt+Shift+A"
      },
      "description": "Send a 'detach-to-window' event to the extension"
    },
    "resize-window": {
      "suggested_key": {
        "default": "Alt+Shift+R"
      },
      "description": "resize window"
    },
    "detach-duplicate-tab-to-window": {
      "suggested_key": {
        "default": "Alt+Shift+D"
      },
      "description": "duplicate tab to new window"
    }
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}