diff --git a/pkgs/applications/networking/irc/chatzilla/builder.sh b/pkgs/applications/networking/irc/chatzilla/builder.sh
new file mode 100755
index 00000000000..84c189a559b
--- /dev/null
+++ b/pkgs/applications/networking/irc/chatzilla/builder.sh
@@ -0,0 +1,5 @@
+source $stdenv/setup
+
+ensureDir $out
+unzip $src -d $out
+
diff --git a/pkgs/applications/networking/irc/chatzilla/default.nix b/pkgs/applications/networking/irc/chatzilla/default.nix
new file mode 100644
index 00000000000..644044cf2d6
--- /dev/null
+++ b/pkgs/applications/networking/irc/chatzilla/default.nix
@@ -0,0 +1,12 @@
+{stdenv, fetchurl, unzip}:
+
+stdenv.mkDerivation {
+  name = "chatzilla-0.9.70";
+  builder = ./builder.sh;
+  src = fetchurl {
+    url = http://rdmsoft.com/dlfs/cz/chatzilla-0.9.70-xr.zip;
+    md5 = "543ab121916b8c4bfe20d4aa07536e35";
+  };
+
+  buildInputs = [unzip];
+}
diff --git a/pkgs/development/interpreters/xulrunner/builder.sh b/pkgs/development/interpreters/xulrunner/builder.sh
new file mode 100644
index 00000000000..8a7f01d3fe3
--- /dev/null
+++ b/pkgs/development/interpreters/xulrunner/builder.sh
@@ -0,0 +1,23 @@
+source $stdenv/setup
+
+postInstall=postInstall
+postInstall() {
+    strip -S $out/lib/*/* || true
+
+    # 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.
+    cd $out/bin
+    mv xulrunner ../lib/xulrunner-*/
+    ln -s ../lib/xulrunner-*/xulrunner .
+
+    echo "running xulrunner --register-global..."
+    $out/bin/xulrunner --register-global || true
+
+    # xulrunner wants to create these directories at the first startup
+    cd $out
+    ensureDir ./lib/xulrunner-*/extensions
+    ensureDir ./lib/xulrunner-*/updates
+}
+
+genericBuild
diff --git a/pkgs/development/interpreters/xulrunner/default.nix b/pkgs/development/interpreters/xulrunner/default.nix
new file mode 100644
index 00000000000..5f811133bde
--- /dev/null
+++ b/pkgs/development/interpreters/xulrunner/default.nix
@@ -0,0 +1,29 @@
+{stdenv, fetchurl, pkgconfig, gtk, perl, zip, libIDL, libXi}:
+
+stdenv.mkDerivation {
+  name = "xulrunner-1.8.0.1";
+
+  builder = ./builder.sh;
+  src = fetchurl {
+    url = http://ftp.mozilla.org/pub/mozilla.org/xulrunner/releases/1.8.0.1/source/xulrunner-1.8.0.1-source.tar.bz2;
+    md5 = "d60ccb6cc28afa7d880c8602a2c88450";
+  };
+
+  buildInputs = [pkgconfig gtk perl zip libIDL libXi];
+  configureFlags = [
+    "--enable-application=xulrunner"
+    "--enable-optimize"
+    "--disable-debug"
+    "--enable-xft"
+    "--disable-freetype2"
+    "--enable-swg"
+    "--enable-strip"
+    "--enable-default-toolkit=gtk2"
+    "--with-system-jpeg"
+    "--with-system-png"
+    "--with-system-zlib"
+    "--disable-gnomevfs"
+    "--disable-gnomeui"
+    "--disable-javaxpcom"
+    ];
+}
diff --git a/pkgs/development/interpreters/xulrunner/wrapper/builder.sh b/pkgs/development/interpreters/xulrunner/wrapper/builder.sh
new file mode 100644
index 00000000000..30561cbf182
--- /dev/null
+++ b/pkgs/development/interpreters/xulrunner/wrapper/builder.sh
@@ -0,0 +1,11 @@
+source $stdenv/setup
+
+ensureDir $out/bin
+
+wrapper="$out/bin/$launcher"
+
+echo "#! $SHELL -e" > $wrapper
+echo "" >> $wrapper
+echo "$xulrunner/bin/xulrunner $appfile \"\$@\"" >> $wrapper
+
+chmod +x $wrapper
diff --git a/pkgs/development/interpreters/xulrunner/wrapper/default.nix b/pkgs/development/interpreters/xulrunner/wrapper/default.nix
new file mode 100644
index 00000000000..e6d8ee6bbd5
--- /dev/null
+++ b/pkgs/development/interpreters/xulrunner/wrapper/default.nix
@@ -0,0 +1,9 @@
+{stdenv, xulrunner, application, launcher}:
+
+stdenv.mkDerivation {
+  name = application.name;
+
+  builder = ./builder.sh;
+  inherit xulrunner launcher;
+  appfile = application ~ "application.ini";
+}
diff --git a/pkgs/system/all-packages-generic.nix b/pkgs/system/all-packages-generic.nix
index 8deaac6d0f4..0d7f88ec7a2 100644
--- a/pkgs/system/all-packages-generic.nix
+++ b/pkgs/system/all-packages-generic.nix
@@ -1842,6 +1842,18 @@ rec {
     inherit (xlibs) libXi;
   };
 
+  xulrunner = (import ../development/interpreters/xulrunner) {
+    inherit fetchurl stdenv pkgconfig perl zip;
+    inherit (gtkLibs) gtk;
+    inherit (gnome) libIDL;
+    inherit (xlibs) libXi;
+  };
+
+  xulrunnerWrapper = {application, launcher}:
+    (import ../development/interpreters/xulrunner/wrapper) {
+      inherit stdenv xulrunner application launcher;
+    };
+
   wrapFirefox = firefox: (import ../applications/networking/browsers/firefox-wrapper) {
     inherit stdenv firefox;
     plugins = [
@@ -1905,6 +1917,14 @@ rec {
     inherit (gtkLibs) glib gtk;
   };
 
+  chatzilla = 
+    xulrunnerWrapper {
+      launcher = "chatzilla";
+      application = (import ../applications/networking/irc/chatzilla) {
+          inherit fetchurl stdenv unzip;
+        };
+    };
+
   rsync = (import ../applications/networking/sync/rsync) {
     inherit fetchurl stdenv;
   };
diff --git a/pkgs/system/populate-cache.nix b/pkgs/system/populate-cache.nix
index 662c25fcaaf..405117dd83f 100644
--- a/pkgs/system/populate-cache.nix
+++ b/pkgs/system/populate-cache.nix
@@ -21,6 +21,7 @@ let {
     bsdiff
     bzip2
     callgrind
+    chatzilla
     cksfv
     coreutils
     darcs
@@ -114,6 +115,7 @@ let {
     xmms
     xorg_sys_opengl
     xsel
+    xulrunner
     zapping
     zdelta
     zip