Examine source code of Tab Shortcuts pro

{
  "name": "Tab Shortcuts plus",
  "version": "1.0",
  "description": "Allows pinning and duplication of tabs via keyboard shortcuts.",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "tab_shortcuts.js"
    ],
    "persistent": false
  },
  "commands": {
    "toggle-pin-tab": {
      "suggested_key": {
        "default": "Ctrl+Shift+X",
        "mac": "Command+Shift+X"
      },
      "description": "Toggles whether the current tab is pinned."
    },
    "duplicate-tab": {
      "suggested_key": {
        "default": "Ctrl+Shift+Z",
        "mac": "Command+Shift+Z"
      },
      "description": "Duplicates the current tab."
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{5be7114a-ec7b-490d-a44e-d5956f125e4b}"
    }
  }
}