n Widows 7, aero glass effect looks very nice. You can update your firefox browser too to have same glassy effects. To look firefox look transparent like glassy effect ypu need to download and install an ADD-ON in firefox.
This add on is only for windows.
Add to firefox
https://addons.mozilla.org/firefox/downloads/latest/13905/platform:5/addon-13905-latest.xpi?src=addondetail