Signal Desktop now includes support for a new “Screen security” setting that is designed to help prevent your own computer from capturing screenshots of your Signal chats on Windows. This setting is automatically enabled by default in Signal Desktop on Windows 11. If you’re wondering why we’re on...
It could be something that websites could then tell the browser using a header or meta tag
I’d still want the browser to at least be able to do it as a default, not at the whim of specific sites.