If you've used Firefox 4 and Panorama, you might have noticed that Mozilla's new browser doesn't always save your tab groupings when you close the browser -- a bit of a pain, if you spend a long time setting up the perfect groups! This is tied into the removal of the 'Save and Quit' dialog box -- and enabling Panorama tab group saving is just a matter of re-enabling the Save and Quit dialog.
Open a new tab and head to about:config. Click through the warning and type 'quit' into the filter box. Double click browser.showQuitWarning to change its value to true (see image after the break). That's it -- now you'll have the option of saving your tabs, and thus tab groups, when you close Firefox.
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