Works perfect with Tor Rated 4 out of 5 stars
This Add-on is made for using Tor! Due to the reason that it does not make much sense to use Tor to browse anonymously while logged in on a website like gmail or facebook it just enables the Tor proxy settings while switching to the private mode of Firefox only. This also helps to avoid identification by Browser cookies hence private browsing does not store them.
It would be great to use two different proxies at the same time (one in non-private firefox windows and one in private windows). This would make me give 5 stars to this plugin!
Finally someone realized :D It works particularly well in combination with the Tor background service!
Being logged in while on Tor is perfectly safe as long as you make sure everything is going through SSL btw :)
Also, PBP switches back to whatever your connection type was before you opened private browsing, so your dual-proxy idea is already implemented :) Just have a proxy configured during regular browsing, and set the Tor proxy using one of the other proxy options. Or do you need me to add a GUI to configure 2 profiles for the same proxy type to switch between? The add-on can then just switch between Manual 1 and Manual 2, for example.