It is impossible to bind a hotkey to Ctrl+W

[ATMunn]

In most browsers, this simply closes the tab. And also, even after I downloaded a plugin for Firefox and rebound the key to close the tab, it still seems to not work. I'm not sure if it would work in a different browser though. Either way, it's kind of annoying.
EDIT: It seems that someone else has also reported a similar issue, for Ctrl+F4.

[Vollkornaffe]

Click on the field you want to set and open up console (with f12 by default)

then type in

assign_key({code: 87, shift: false, alt: false, ctrl: true})

and hit enter!

[DerSaidin]

Same with Ctrl + Q, Ctrl + T