Rated 4 out of 5 stars

The addon works prerfectly but the option to change the shortcuts would be very helpful, the one confilcting is duplicate tab (Ctrl+Alt+T) with switch to private tab.
Also (Ctrl+Alt+P) in FF29 is opening a new normal tab,
which will be ofcourse fixed soon,
(Using TabMixPlus)

This review is for a previous version of the add-on (0.1.7.1.1-signed). 

> but the option to change the shortcuts would be very helpful
You can modify extensions.privateTab.key.* preferences on about:config page, see
https://github.com/Infocatcher/Private_Tab/blob/0.1.7.1/defaults/preferences/prefs.js#L9-L16

> Also (Ctrl+Alt+P) in FF29 is opening a new normal tab
> (Using TabMixPlus)
Strange, works fine for me with Tab Mix Plus.
But this may be caused by some another extension, see
https://github.com/Infocatcher/Private_Tab/tree/0.1.7.1#known-issues
=> https://github.com/Infocatcher/Private_Tab/issues/110