How to disable Ctrl + Shift + C shortcut in Firefox?

Pressing Ctrl+Shift+C in Firefox opens the developer tools and activates the "Pick element" tool.

I often mistakenly use this shortcut when I want to copy something (mixing it up with the shortcut to copy text in terminals).

It's really annoying since

it doesn't copy the text
it opens the developer tools
I can't even close the developer tools by using this shortcut again, I need to reach for the mouse to close it

One solution appeared to be the Firefox "customizable shortcuts" extensions, but it has been discontinued.

Any other idea?

Solution

Install Menu Wizard, click on Keyboard shortcuts, find key_inspector, delete the shortcut.