how to run GIMP in firefox 10.0.2

[周龙 <cc_subhero 163 com>]

  Recently I install GTK+3.2.3 in my ubuntu 11.04 and I want to run GIMP(its version is 2.6.11) in the firefox. Unfortunately,I cannot implement it.  (The GNome version is 2.32.1).

 I built the GTK+3.2.3 with --enable-x11-backend --enable-broadway-backend and enabled the network.websocket.enabled and network.websocket.override-security-block. When I input GDK_BACKEND=broadway  GIMP , the GIMP can work but not in the firefox 10.0.2. 

  I think  I must make some mistakes in somewhere ,just I can find it .So I hope someone can help me.Thank you.