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I'm on Windows 10, how can I switch tabs with Alt+[1-9] instead of Ctrl+[1-9]?

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Look, in Windows I switch tabs with Alt+Tab, in any text editor that I use I switch tabs with Alt+[1-9] and every time I switch from Sublime Text (or whatever) to Firefox and I want just to rapidly switch to another tab I need to move my left thumb from Alt to Ctrl, which is very uncomfortable, first of all, annoying and time consuming. I NEED to remap the shortcuts to Alt+[1-9] instead of Ctrl+[1-9]. Please help, this is driving me insane.

Look, in Windows I switch tabs with Alt+Tab, in any text editor that I use I switch tabs with Alt+[1-9] and every time I switch from Sublime Text (or whatever) to Firefox and I want just to rapidly switch to another tab I need to move my left thumb from Alt to Ctrl, which is very uncomfortable, first of all, annoying and time consuming. I NEED to remap the shortcuts to Alt+[1-9] instead of Ctrl+[1-9]. Please help, this is driving me insane.

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That would be a Windows function not a FF problem. You need to look at your Keyboard configuration to redo the keyboard mapping. FF can't do this since Windows controls this function.

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You don't get it. In Firefox you use Ctrl+[1-9] to switch tabs (on Windows at least, on Ubuntu it's Alt+[1-9] as it should be). I want to switch tabs with Alt+[1-9]. The equivalent question would be: How do I remap keyboard shortcuts in Firefox? Do you get it now?