new feature: prevent tab close

[superjase]

could you implement a prevent accidental browser / browser tab close?

like this one: https://maki-chan.de/preventclose.htm

simple little js

window.onbeforeunload = function() {
return "Would you really like to close your browser?";
}

<script src="/preventclose.js" integrity="sha384-WrrSeAWImvDziYDe8uybH2tyOvfF6q6914A1th0V7CEYCb/VzXSCCxv/bwDxjDiA"></script>