^w is delete word in vim/bash/everywhere else. It’s terrible whenever I accidentally type this in the browser and the window closes. I typically close terminal windows with ctrl-d so I have this mapped in my browser as well. It’s really muscle memory and I do not want to change it

By that same logic, ^w is used as close window everywhere else

Not for me, I hardly use anything GUI apart from my browser. Can’t actually think of anything right now apart from some niche tools. Either way, the fact that I can customise it that easily in Chrome but not in Firefox is a huge factor why I don’t like using Firefox

Not in Windows (pun unintended) where it works only in Explorer.