How to Reopen a Tab in Firefox
If you have ever accidentally closed one of many opened tabs in Firefox, you may not even know which tab it was. That leaves you wondering which URL was loaded, and which one you need to reopen. In older versions of Firefox, your only recourse was to root through your history files and try to find the absent tab. However, Firefox 4 allows you to easily reopen a closed tab.
Instructions
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1
Right-click any tab at the top of the Firefox window.
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2
Click "Undo Close Tab" from the pop-up menu to make the last tab closed reopen.
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3
Repeat the process to reopen older tabs until the one you need reappears.
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