We used to run terminal in browser using https://github.com/yudai/gotty and the entire dev team remapped their Ctrl+w to Ctrl+`. We did frontend and backend development with this setup almost for 1.5 years. Muscles memory and till this date, always have the fear if my actual terminal will get closed if I use Ctlr+w :P

Which is why macOS command key is such an undervalued nicety. One key for GUI stuff, one for command-line stuff.

You can use ctrl+shift+t to open the recently closed tab again.

hello, creator here, sorry about that. In this case you can click again on the "Open the Server Terminal in a New Window" button

I feel your pain - bites me from time to time, especially in KVM ;)