评分4星,满分5星

It would be useful to put an icon(Firefox default?) in the tab to indicate that it is in private mode, otherwise it is difficult to identify those specific privative tabs from other tabs when there are many tabs open.

这个评论是针对附加组件的一个早期版本的(0.1.6.1-signed)。 

You can found some styles to change appearance of private tabs here:
https://github.com/Infocatcher/Private_Tab#styles