Absolutely beautiful, thank you so much. This was the deciding factor for me to switch to firefox all the way. It's really odd how is this not native functionality.

Thank you so much. I don't need to 'right click the tab and hit D' anymore. 🤓

I keep thinking I can replace this add-on. Unfortunately, this is not true. Once you have grown accustomed to the ease and power of this add-on, there is no other add-on that can possibly replace it.

Doesn't work on Manjaro KDE with FF 122.0.1

Edit: Works now after reassigning the shortcut because alt+shift+d was already in use by another extension (Dark Reader). Would be five stars if it was possible to toggle whether to switch to the duplicated tab.

Edit2: FIVE STARS AND A SEAL OF APPROVAL!

(There's a bug where the "Open new tabs in the background" feature doesn't seem to work with "New tab to the right" no matter what shortcut I try to assign to it)

Does just about it.

Nice and fast I used ctrl+shift+v. almost every single shortcut is already taken so youhave to be creative.

go into the settings tab to change keys

Amazing, I love it.

If you need ideas for keybinds, I suggest Alt-T to duplicate tab, Alt-N to pop tab to a new window.

To me the 'Pop tabs to a new window' is as important, if not more important than the 'Duplicate tab' shortcut, so the name of the extension is unfortunately a bit misleading..

It works for what I wanted it to — duplicating tabs with a hotkey — so I am completely satisfied. And, on top of that, it also supports a hotkey for another great feature: new tab to the right. This extension is amazing, I love it.

Sadly, it's not working for me.
Pressing [Alt]+[Shift]+D just opens the menu bar as if I was just pressing [Alt].

(using Firefox 99.0.1 on Windows 10)

I think it has something to do with localization. I use a german translation, where the "File" menu is called "Datei". So [Alt]+D opens that Dropdown for me ignoring [Shift].

It says in the description, that "Shortcut is configurable.", but I cannot find where.
//Update: I found it, thanks to the Screenshot. I'm just stupid. Sorry.

I changed it to [Alt]+[Shift]+K in manifest-json and created the extension myself for self-distribution.