Rated 5 out of 5 stars

Really like new private: feature, I just edit some of my bookmarks to open it self in private tab without having to open private tab first and open bookmark after! Only thing that annoy me a little is that private bookmark shows blank favicon.

And since I put New Private Tab button in Australis hamburger menu, default icon is not matching Firefox icon style, so I have to manually download XPI and replace icon file with icon that look like default New Private Window icon. ;)

This review is for a previous version of the add-on (0.1.7.2.1-signed). 

> Really like new private: feature
Oh, not so new, but was improved. :)

https://addons.mozilla.org/addon/private-tab/versions/0.1.5
> 0.1.4 (2013-08-19)
> + Implemented "private" protocol: now we can use special URLs to open private tabs from bookmarks or from command line (example: private:///#https://addons.mozilla.org/, may be disabled using extensions.privateTab.enablePrivateProtocol preference) (#89)


> Only thing that annoy me a little is that private bookmark shows blank favicon.
Hmm... should work fine with most pages with "/favicon.ico" favicons, like
https://www.google.com/
https://www.google.com/favicon.ico
Anyway, I'll try to improve this:
https://github.com/Infocatcher/Private_Tab/issues/147


> And since I put New Private Tab button in Australis hamburger menu, default icon is not matching Firefox icon style, so I have to manually download XPI and replace icon file with icon that look like default New Private Window icon. ;)

You can use userChrome.css or Stylish
http://kb.mozillazine.org/UserChrome.css
https://addons.mozilla.org/addon/stylish/
to change icon, example:

/* Special icon for Australis menu */
#privateTab-toolbar-openNewPrivateTab[cui-areatype="menu-panel"] {
    list-style-image: url("chrome://privatetab/content/privacy-32.png") !important;
    filter: url("chrome://mozapps/skin/extensions/extensions.svg#greyscale") !important;
}