diff --git a/pkgs/applications/networking/browsers/firefox-3/default.nix b/pkgs/applications/networking/browsers/firefox-3/default.nix
index 8095033953cd..0d2df6ab1143 100644
--- a/pkgs/applications/networking/browsers/firefox-3/default.nix
+++ b/pkgs/applications/networking/browsers/firefox-3/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl, pkgconfig, gtk, pango, perl, python, zip, libIDL
-, libjpeg, libpng, zlib, cairo, dbus, dbus_glib, bzip2, xlibs
-, freetype, fontconfig
+, libjpeg, zlib, cairo, dbus, dbus_glib, bzip2
+, freetype, fontconfig, xulrunner
 
 , # If you want the resulting program to call itself "Firefox" instead
   # of "Deer Park", enable this option.  However, those binaries may
@@ -19,11 +19,12 @@ stdenv.mkDerivation {
   };
 
   buildInputs = [
-    pkgconfig gtk perl zip libIDL libjpeg libpng zlib cairo bzip2
+    pkgconfig gtk perl zip libIDL libjpeg zlib cairo bzip2
     python dbus dbus_glib pango freetype fontconfig
-    xlibs.libXi xlibs.libX11 xlibs.libXrender xlibs.libXft xlibs.libXt
   ];
 
+  propagatedBuildInputs = [xulrunner];
+
   configureFlags = [
     "--enable-application=browser"
     "--enable-optimize"
@@ -36,35 +37,21 @@ stdenv.mkDerivation {
     "--enable-system-cairo"
     #"--enable-system-sqlite" # <-- this seems to be discouraged
     "--disable-crashreporter"
+    "--with-libxul-sdk=${xulrunner}/lib/xulrunner-devel-${xulrunner.version}"
   ];
 
   postInstall = ''
-    export dontPatchELF=1;
-
-    # Strip some more stuff
+    # Strip some more stuff.
     strip -S $out/lib/*/* || true
 
-    # Fix some references to /bin paths in the Firefox shell script.
-    substituteInPlace $out/bin/firefox \
-        --replace /bin/pwd "$(type -tP pwd)" \
-        --replace /bin/ls "$(type -tP ls)"
-    
-    # This fixes starting Firefox when there already is a running
-    # instance.  The `firefox' wrapper script actually expects to be
-    # in the same directory as `run-mozilla.sh', apparently.
     libDir=$(cd $out/lib && ls -d firefox-[0-9]*)
     test -n "$libDir"
-    cd $out/bin
-    mv firefox ../lib/$libDir/
-    ln -s ../lib/$libDir/firefox .
+    
+    ln -s ${xulrunner}/lib/xulrunner-${xulrunner.version} $out/lib/$libDir/xulrunner
 
-    # Register extensions etc.
+    # Register extensions etc. !!! is this needed anymore?
     echo "running firefox -register..."
-    (cd $out/lib/$libDir && LD_LIBRARY_PATH=. ./firefox-bin -register) || false
-
-    # Put the Firefox icon in the right place.
-    ensureDir $out/lib/$libDir/chrome/icons/default
-    ln -s ../../../icons/default.xpm  $out/lib/$libDir/chrome/icons/default/
+    $out/bin/firefox -register
   ''; # */
 
   meta = {
@@ -72,7 +59,10 @@ stdenv.mkDerivation {
     homepage = http://www.mozilla.com/en-US/firefox/;
   };
 
-  passthru = {inherit gtk;};
+  passthru = {
+    inherit gtk;
+    isFirefox3Like = true;
+  };
 }
 
 
diff --git a/pkgs/applications/networking/browsers/firefox-3/xulrunner.nix b/pkgs/applications/networking/browsers/firefox-3/xulrunner.nix
index e75b40ff7800..3c38ed58ceda 100644
--- a/pkgs/applications/networking/browsers/firefox-3/xulrunner.nix
+++ b/pkgs/applications/networking/browsers/firefox-3/xulrunner.nix
@@ -9,12 +9,18 @@
   enableOfficialBranding ? false
 }:
 
+let
+
+  version = "1.9.0.3"; # this attribute is used by other packages
+
+in  
+
 stdenv.mkDerivation {
-  name = "xulrunner-1.9.0.1";
+  name = "xulrunner-${version}";
 
   src = fetchurl {
-    url = http://releases.mozilla.org/pub/mozilla.org/firefox/releases/3.0.1/source/firefox-3.0.1-source.tar.bz2;
-    sha1 = "ba3bb0b02404cf1abfb6189b156b2f4eb02e8975";
+    url = http://releases.mozilla.org/pub/mozilla.org/firefox/releases/3.0.3/source/firefox-3.0.3-source.tar.bz2;
+    sha1 = "089a41ff079cd37d39d19cf3a51daba07337db2c";
   };
 
   buildInputs = [
@@ -75,7 +81,7 @@ stdenv.mkDerivation {
     homepage = http://www.mozilla.com/en-US/firefox/;
   };
 
-  passthru = {inherit gtk;};
+  passthru = { inherit gtk version; };
 }
 
 
diff --git a/pkgs/applications/networking/browsers/icecat-3/default.nix b/pkgs/applications/networking/browsers/icecat-3/default.nix
index 95f4f4ab77fc..b22fe9b6d802 100644
--- a/pkgs/applications/networking/browsers/icecat-3/default.nix
+++ b/pkgs/applications/networking/browsers/icecat-3/default.nix
@@ -103,7 +103,10 @@ stdenv.mkDerivation {
     licenses = [ "GPLv2+" "LGPLv2+" "MPLv1+" ];
   };
 
-  passthru = {inherit gtk;};
+  passthru = {
+    inherit gtk;
+    isFirefox3Like = true;
+  };
 }
 
 
diff --git a/pkgs/applications/networking/browsers/mozilla-plugins/mplayerplug-in/default.nix b/pkgs/applications/networking/browsers/mozilla-plugins/mplayerplug-in/default.nix
index e3ac37ba8ccd..330fac098620 100644
--- a/pkgs/applications/networking/browsers/mozilla-plugins/mplayerplug-in/default.nix
+++ b/pkgs/applications/networking/browsers/mozilla-plugins/mplayerplug-in/default.nix
@@ -1,4 +1,4 @@
-{stdenv, fetchurl, pkgconfig, browser, browserName, libXpm, gettext}:
+{stdenv, fetchurl, pkgconfig, browser, libXpm, gettext}:
 
 stdenv.mkDerivation rec {
   name = "mplayerplug-in-3.55";
@@ -9,13 +9,10 @@ stdenv.mkDerivation rec {
   };
 
   patches =
-    (if browserName == "icecat"  # FIXME: Should match Firefox 3 as well.
-     then [ ./icecat3-idldir.patch ]
-     else []);
+    stdenv.lib.optional (browser ? isFirefox3Like) ./icecat3-idldir.patch;
 
   postConfigure =
-    (if browserName == "icecat"  # FIXME: Should match Firefox 3 as well.
-     then ''
+    (if browser ? isFirefox3Like then ''
        # Cause a rebuild of these file from the IDL file, needed for GNU IceCat 3
        # and Mozilla Firefox 3.
        # See, e.g., http://article.gmane.org/gmane.comp.mozilla.mplayerplug-in/2104 .
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 08ed64bb7e5d..12af51b435f0 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7144,11 +7144,12 @@ let
   firefoxWrapper = wrapFirefox firefox "firefox" "";
 
   firefox3 = lowPrio (import ../applications/networking/browsers/firefox-3 {
-    inherit fetchurl stdenv pkgconfig perl zip libjpeg libpng zlib cairo
-      python dbus dbus_glib freetype fontconfig bzip2 xlibs;
+    inherit fetchurl stdenv pkgconfig perl zip libjpeg zlib cairo
+      python dbus dbus_glib freetype fontconfig bzip2;
     inherit (gtkLibs) gtk pango;
     inherit (gnome) libIDL;
     #enableOfficialBranding = true;
+    xulrunner = xulrunner3;
   });
 
   xulrunner3 = lowPrio (import ../applications/networking/browsers/firefox-3/xulrunner.nix {
@@ -7159,10 +7160,6 @@ let
     #enableOfficialBranding = true;
   });
 
-  firefox3Xul = lowPrio ((symlinkJoin "firefox-3-with-xulrunner" [firefox3 xulrunner3]) // {
-    inherit (firefox) gtk;
-  });
-
   firefox3b1Bin = lowPrio (import ../applications/networking/browsers/firefox-3/binary.nix {
     inherit fetchurl stdenv pkgconfig perl zip libjpeg libpng zlib cairo
       python curl coreutils freetype fontconfig;
@@ -7180,7 +7177,7 @@ let
 
   flac = getVersion "flac" flacAlts;
 
-  flashplayer = flashplayer9;
+  flashplayer = flashplayer10;
 
   flashplayer9 = import ../applications/networking/browsers/mozilla-plugins/flashplayer-9 {
     inherit fetchurl stdenv zlib alsaLib;
@@ -7519,9 +7516,9 @@ let
   };
   */
 
-  MPlayerPlugin = browser: browserName:
+  MPlayerPlugin = browser:
     import ../applications/networking/browsers/mozilla-plugins/mplayerplug-in {
-      inherit browser browserName;
+      inherit browser;
       inherit fetchurl stdenv pkgconfig gettext;
       inherit (xlibs) libXpm;
       # !!! should depend on MPlayer
@@ -7967,7 +7964,7 @@ let
         ++ lib.optional (enableAdobeFlash)  flashplayer
         # RealPlayer is disabled by default for legal reasons.
         ++ lib.optional (system != "i686-linux" && getConfig [browserName "enableRealPlayer"] false) RealPlayer
-        ++ lib.optional (getConfig [browserName "enableMPlayer"] true) (MPlayerPlugin browser browserName)
+        ++ lib.optional (getConfig [browserName "enableMPlayer"] true) (MPlayerPlugin browser)
         ++ lib.optional (supportsJDK && getConfig [browserName "jre"] false && jrePlugin ? mozillaPlugin) jrePlugin
        );
   };