If you spend all day working with Firefox tabs, you will love the Tab To Window extension. Price CTRL-SHIFT-N to move your tab to a new window or CTRL-ALT-N to copy it to a new window. I find this especially useful when I have a problem in one window and find the step-by-step solution in another. Rather than switching back and forth to execute each step, I copy the tab to a new window. It's even more useful if you use two monitors!
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Sharing the tips and tricks that have saved us thousands of hours of time.