diff -up gimp-2.4.0/app/config/gimpguiconfig.c.xdg-open gimp-2.4.0/app/config/gimpguiconfig.c
--- gimp-2.4.0/app/config/gimpguiconfig.c.xdg-open	2007-05-21 10:56:29.000000000 +0200
+++ gimp-2.4.0/app/config/gimpguiconfig.c	2007-10-24 10:43:49.000000000 +0200
@@ -40,7 +40,7 @@
 #ifdef G_OS_WIN32
 #  define DEFAULT_WEB_BROWSER      "not used on Windows"
 #else
-#  define DEFAULT_WEB_BROWSER      "firefox %s"
+#  define DEFAULT_WEB_BROWSER      "xdg-open %s"
 #endif
 
 
diff -up gimp-2.4.0/etc/gimprc.xdg-open gimp-2.4.0/etc/gimprc
--- gimp-2.4.0/etc/gimprc.xdg-open	2007-10-22 21:45:59.000000000 +0200
+++ gimp-2.4.0/etc/gimprc	2007-10-24 10:43:58.000000000 +0200
@@ -625,7 +625,7 @@
 # appended to the command with a space separating the two.  This is a single
 # filename.
 # 
-# (web-browser "firefox %s")
+# (web-browser "xdg-open %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