Rated 1 out of 5 stars

Firefox/3.6.24 - works fine

How to:

1. Download theme
Press "Install Anyway"
In opened dialog copy theme url (https://addons.mozilla.org/firefox/downloads/latest/13347/addon-13347-latest.jar?src=dp-btn-primary)
Click "Cancel"
Download it

2. Edit theme
Unzip file install.rdf from grayfox-
Open install.rdf in text editor
Find <em:maxVersion>3.6a2pre</em:maxVersion>
Change like this <em:maxVersion>3.6.99</em:maxVersion>
Save it
Replace to archive (grayfox- new file install.rdf

3.Add theme to FF
Open additions - theme (add new theme)