Rated 4 out of 5 stars

Glad to see Noia back, but there are some bugs with the title bar when you hide the Menu Bar on Windows XP. Windows Vista/7 options try running on Windows XP instead of being ignored.

All you need is a custom Firefox app button on Windows XP and nothing else.

This review is for a previous version of the add-on (1.1.6.1). 

I don't know whats wrong with your FF but here is anything fine on WinXP. Look at the pic.
http://img541.imageshack.us/i/81353373.png/

You have to set the titlebaroption from Aero Basic when you hide the menubar on XP.

"Windows Vista/7 options try running on Windows XP instead of being ignored"-> I don't understand what you mean by that.

"All you need is a custom Firefox app button on Windows XP and nothing else."-> I could add some color to the FF appbutton on XP, but first look at the screenshot. I think there is something wrong with your Firefox. Maybe some extension does not work correctly with Noia4/Noia4 options.

Try to backup your setting and create a clean FF profile for testing. Use the options like shown an the screenshot.

EDIT: http://img847.imageshack.us/i/previewpv.png/
1. default on XP
2. black XP
3. blue XP
It will be like on the picture in v1.1.7.