Disable `ctrl+shift+w` shortcut in Firefox Linux

It is possible to do this with a Firefox add-on. The one I have found in the past is Customizable Shortcuts. You can find it here. It gives you a new page in your Firefox options that allows you to reassign the shortcuts used for each command. For example, I set the close window command that was Ctrl+Shift+W to be something I would never accidentally use, such as Ctrl+Alt+Shift+9. It works pretty well on the Windows version of Firefox, although I admit I don't know about add-on cross compatibility with Linux.