Yep, Internet Explorer had this 'security zone' feature which privileged localhost/file urls, except it was too easy to confuse it about what 'zone' it was runn

Yep, Internet Explorer had this 'security zone' feature which privileged localhost/file urls, except it was too easy to confuse it about what 'zone' it was running in, leading to endless security bugs. Probably the worst feature of the browser.