We're moving towards a per-window private browsing implementation, which means that the text on this page <http://support.mozilla.org/1/firefox/20.0a1/Darwin/en-US/private-browsing> needs to get updated. We can use the version number to determine which version of the text to use. Currently we're targeting this for Firefox 20. This page is linked to from about:privatebrowsing, which gets opened when you open a new private window (the "learn more" link.)
Thanks for letting me know about this. It's on my list for Firefox 20 documentation. I'll close this bug though since we don't track articles with bugzilla.
(In reply to comment #1) > Thanks for letting me know about this. It's on my list for Firefox 20 > documentation. I'll close this bug though since we don't track articles with > bugzilla. OK, please let me know if there is anything I can help with, then. Thanks!