I like using Firefox. But there is an area of my use in private browsing, where I want to have either multiple instances of windows or tabs open and they are recognised as separate browing instances. Example of what I would like to see is, when I enter a website in private browsing, most sites would ask me to accept cookies. If I either accept or reject without closing this original another private window, it'd remember I've already chosen. As far as I know, chrome also acts like this. But someone has pointed out Safari doesn't. I've tried it, and it does what I need. However as put in the beginning, I like using Firefox, and is wondering if anyone know if there are any plugins or settings in about:config that can make it happen? Thank you in advance!