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Duplicate tab option is present here in Firefox 57. It's in the right click context menu on any tab.

Is it too much to ask for a simple shortcut, like Ctrl+K

Ctrl+T ... new Tab

Ctrl+K ... dublicate Tab

Ctrl+W ... close Tab

I won't start clicking around on the tabs. Please add the missing shortcut (Ctrl+K)

can you file a bug in bugzilla.mozilla.org? It should be easy to do!

source: I added the duplicate tab context menu option in Fx57

Ctrl+K is already search in both Firefox and Chrome.