This makes the Sidebar undockable (shows as an independend window). And, panels become editable easily by drag and drop. For Mozilla Firefox, Ver.3.0 (Ez Sidebar) or later is available.
If you see any problem, see FAQ at first. If there is no solution, post a report to the issue tracker on the GitHub please.
If you use Mozilla Suite or Netscape 7, see How to install and update? (contains important notes) This extension includes a self uninstaller. Please open the context menu on the Sidebar, choose Version Info, and click Uninstall. When you couldn't remove it completely, see How to uninstall by hand?
You can dock/undock the Sidebar from parents by one of following ways.
And, you can collapse / expand floating (undocked) sidebar with double-click.
Following features/behaviors are available for Sidebar Panels after you installed this:
Array.concat()
have been fixed.