[arch-general] Firefox Ctrl-W

Has anyone been able to figure out how to disable the Ctrl-W shortcut in Firefox? As a Vim user I'm constantly accidentally closing tabs when I want to delete the last word in a text field. It seems to be _very_ difficult to find a reliable method to do this short of recompiling Firefox. I use Plasma Desktop. If there's some way to filter events going to the browser window, that's a viable solution too, but I haven't found any way so far. Many thanks, Paul