--- gimp-2.2.13/etc/gimprc	2006-08-24 22:54:29.000000000 +0200
+++ gimp-2.2.13/etc/gimprc-browserfix	2007-01-10 21:55:54.000000000 +0100
@@ -586,6 +586,7 @@
 # filename.
 # 
 # (web-browser "mozilla %s")
+(web-browser "firefox %s")
 
 # The window type hint that is set on the toolbox. This may affect how your
 # window manager decorates and handles the toolbox window.  Possible values