By default, Ctrl-Tab will order the previews based on last viewed. Use it with the Shift key (Ctrl-Shift-Tab) to move in reverse direction. With a small modification, you can configure it to scroll through in order of the tabs.
Here's how you change the tab order:
- Open a new tab
- Enter about:config
- Search for browser.ctrlTab.mostRecentlyUsed
- Change the setting from True to False (double-click on True)
- Restart your browser