This is a new MODX Evolution Manager Theme. This Theme is based on MODX Carbon and should work fine on Firefox, Chrome and IE8, IE9.
I named it MODxModern Dark Gray because in the future I want to design the same Theme with different colours.
Click here to discuss about this theme on MODX Forums.
1. Extract the .rar file on your website.
2. Go to "Tools > Configuration > Interface&Features > Manager Theme" and select "MODxModern", then press "Save" to apply the changes.