fryn

Starting in Firefox 20 (currently in beta), we support per-window private browsing! You can get the beta here to use it today: http://www.mozilla.org/en-US/firefox/beta/

I haven't triaged all your points yet, but thank you for the feedback! The screenshots will be very helpful. We like detail-oriented people like you! :)

Getting involved does not necessarily require a lot of experience. On the technical side, I started out in high school just by trying to push a few pixels around (with CSS) and fixing little papercuts like the ones you listed.

Edit: Also, yay for joining Reddit for us! :)