Are there any established ways of preventing a website from appearing as an icon on the 'Most Visited' / 'Speed dial' / start page of a web browser?
One example of this is the tab that opens by default when you start a new Google Chrome window and contains lots of little thumbnails of previously visited websites.
We have privacy concerns around displaying sensitive information from a web app in one of these thumbnails. (Vaguely similar to how sensitive information may be leaked via the task switcher on a mobile device)
I would assume that there was a HTTP header / meta tag that would be able to do this but so far I have not discovered anything in my research.
Cache-directive headers and other standard methods of preventing a page from being cached that we have tried so far don't appear to work.
Edit: I am asking in the position of a service provider running a website that displays sensitive information and doesn't want the user's browser to show that to anyone who can see their screen when they open a new tab.