[ubuntu] Firefox uses Oxygen gtk theme in Unity

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http://ubuntuforums.org – I just installed kubuntu-desktop over Unity and Firefox now looks ugly in Unity. It seems to use oxygen-gtk theme in Unity and I don't particularly like it especially when most other applications look perfectly normal. I also removed kubuntu-firefox-installer package and that doesn't help. See image -- http://i.imgur.com/wvHBH.png Do you know how to make Firefox look normal in Unity? (Hardware)