Which private browsing are you using? Some (such as Chrome's 'incognito' mode) share cookies among all incognito windows until the last is closed. So I was baff

Which private browsing are you using? Some (such as Chrome's 'incognito' mode) share cookies among all incognito windows until the last is closed. So I was baffled when my fresh 'incognito' window was sending cookies on a 1st request somewhere... until I found the older window I'd forgotten about.