A lock-on-browser-restart option would be a useful addition, especially for people who use password managers on shared or work computers. Automatically requiring authentication after a browser restart would add another layer of protection without changing the normal workflow too much.

I think this kind of small security feature is similar to what we see on professional websites like (https://sohailorthocure.pk/) where protecting user information and maintaining privacy is important. Even on healthcare websites, for example, keeping the browsing experience secure and making users feel confident when accessing information should be part of the overall website experience. Features like these may seem simple, but they can make a noticeable difference in user trust and everyday usability.

This seems like a crucial security issue! I can't even understand why this isn't already the case!

Suggestion for the author of this suggestion: Maybe you could rename it to something more relevant so it gets more votes...).