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Re:Firefox 57 as the first release where only WebExtensions ... by chrismorgan on Saturday February 18, 2017 @12:12PM (#13675569)
You can duplicate a tab in stock Firefox by Ctrl-clicking the reload button.
Re:Firefox 57 as the first release where only WebExtensions ... by kibwen on Saturday February 18, 2017 @12:28PM (#13675630)
Alternatively, you can duplicate a tab in stock Firefox by Ctrl+dragging the tab in the tab bar.