The common failure mode, for me, isn't hitting Ctrl-C for copy in a terminal by mistake, it's hitting Ctrl-Shift-C for copy in a browser and ending up with the console open, or hitting Ctrl-W to delete a word and having it close a tab.
The hacks about seems to be basically steal keyboard shortcuts the same way webpages already do; either through an extension[0] or modifying config-pref.js[1]. Neither of which seems very appealing to me. Though, funnily: I did hit Ctrl-W writing this message to delete a word; thank goodness for cache.
[0] https://addons.mozilla.org/en-US/firefox/addon/shortkeys/
[1] https://old.reddit.com/r/firefox/comments/kilmm2/restore_ctr...
My brain can "switch mode" when on a regular web page, but if I open some kind of "terminal in a page" (i.e. I the AWS console), then I'm 100% it will end up with a C-W.
It's right near Ctrl+Q, which usually quits an application.
While Q is mnemonic, W is not.
It's too ergonomic and requires very little wrist movement for such a destructive action.
I understand your pain, but I blame the author of this weird convention for the "close tab" action, whoever they are
I've lost countless SessionManager terminal sessions this way on Windows and Linux.