Browsers like Google Chrome and Mozilla Firefox support 3rd party extensions which can read the page’s content, record requests etc. Some pages like banking websites are extremely sensitive and would like extensions to not have access to them because of the high risk.
A new header should be able to address these concerns. The new header will prevent extensions from reading or interfering with the page’s requests. The user could override it after accepting a warning that explains the risks associated with enabling.
A header “sensitive: true” would be suitable for this.