Firefox 4 will now prompt you regarding the status of your open tabs and Tab Groups. Click on the button labeled Save and Quit. Your browser will now close, but your Tab Groups will be available the next time you launch Firefox 4.
How to Save Firefox 4 Tab Groups Between Sessions
By Scott Orgera, About.com Guide
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- Open Your Firefox 4 Browser
- about:config
- Firefox Preferences
- Toggle Preference Value
- Tab Groups
- Save and Quit
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- How to Save Firefox 4 Tab Groups Between Sessions - Firefox 4 Panorama - Save and Quit, Page 6