Free undockable software for linux

Ez Sidebar is an extension which provides an undockable Sidebar.
This make the sidebar undockable, and provides some tiny features.
Main features:
- This provides the undockable Sidebar. You can detach the Sidebar pane from the browser window and place it to your favorites position. (The undocked Sidebar can raise on top always, and collapse/expand itself automatically with mouseover.)
- This provides the "Sidebar" toggle button to the toolbar. It shows/hides the Sidebar on click. And, you can switch the sidebar panels from the dropdown list of the button directly.
- This allows to take web pages into sidebar panels directly like Mozilla Seamonkey. They will be listed in the "Sidebar" menu and the list of the "Sidebar" button, same as built-in panels, Bookmarks, History, or others. (Firefox can load bookmarks into the Sidebar, so this feature will be no use for some people.)