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About this Add-on
Weights 2 KB, does just one thing.
To prevent the last tab from closing, you could modify the following property in about:config: "browser.tabs.closeWindowWithLastTab" that is true by default.
A note for the “LastTab” users. You probably could note that annoying tab flipping when double clicking a tab. To fix that you could uncheck item “Focus last selected tab when current tab is clicked” in LastTab's options.
— Tab Clicking Options (30KB, knows all about tab clicks)
— Tab Mix Plus (1,7MB unpacked, I prefer LastTab instead)
— middle click :-) not available for laptops