diff --git a/pkgs/applications/networking/browsers/firefox/15.0.nix b/pkgs/applications/networking/browsers/firefox/15.0.nix
deleted file mode 100644
index cb79f4422eb..00000000000
--- a/pkgs/applications/networking/browsers/firefox/15.0.nix
+++ /dev/null
@@ -1,179 +0,0 @@
-{ stdenv, fetchurl, pkgconfig, gtk, pango, perl, python, zip, libIDL
-, libjpeg, libpng, zlib, cairo, dbus, dbus_glib, bzip2, xlibs
-, freetype, fontconfig, file, alsaLib, nspr, nss, libnotify
-, yasm, mesa, sqlite, unzip, makeWrapper, pysqlite
-
-, # If you want the resulting program to call itself "Firefox" instead
-  # of "Shiretoko" or whatever, enable this option.  However, those
-  # binaries may not be distributed without permission from the
-  # Mozilla Foundation, see
-  # http://www.mozilla.org/foundation/trademarks/.
-  enableOfficialBranding ? false
-}:
-
-assert stdenv.gcc ? libc && stdenv.gcc.libc != null;
-
-rec {
-
-  firefoxVersion = "15.0.1";
-
-  xulVersion = "15.0.1"; # this attribute is used by other packages
-
-
-  src = fetchurl {
-    url = "ftp://ftp.mozilla.org/pub/mozilla.org/firefox/releases/${firefoxVersion}/source/firefox-${firefoxVersion}.source.tar.bz2";
-    sha1 = "bdbc4b6656c59b926e18f99b3335484427d08641";
-  };
-
-  commonConfigureFlags =
-    [ "--enable-optimize"
-      "--disable-debug"
-      "--enable-strip"
-      "--with-system-jpeg"
-      "--with-system-zlib"
-      "--with-system-bz2"
-      "--with-system-nspr"
-      "--with-system-nss"
-      # "--with-system-png" # <-- "--with-system-png won't work because the system's libpng doesn't have APNG support"
-      # "--enable-system-cairo" # disabled for the moment because our Cairo is too old
-      "--enable-system-sqlite"
-      "--disable-crashreporter"
-      "--disable-tests"
-      "--disable-necko-wifi" # maybe we want to enable this at some point
-      "--disable-installer"
-      "--disable-updater"
-    ];
-
-
-  xulrunner = stdenv.mkDerivation rec {
-    name = "xulrunner-${xulVersion}";
-
-    inherit src;
-
-    buildInputs =
-      [ pkgconfig gtk perl zip libIDL libjpeg libpng zlib cairo bzip2
-        python dbus dbus_glib pango freetype fontconfig xlibs.libXi
-        xlibs.libX11 xlibs.libXrender xlibs.libXft xlibs.libXt file
-        alsaLib nspr nss libnotify xlibs.pixman yasm mesa
-        xlibs.libXScrnSaver xlibs.scrnsaverproto pysqlite
-        xlibs.libXext xlibs.xextproto sqlite unzip makeWrapper
-      ];
-
-    configureFlags =
-      [ "--enable-application=xulrunner"
-        "--disable-javaxpcom"
-      ] ++ commonConfigureFlags;
-
-    enableParallelBuilding = true;
-
-    preConfigure =
-      ''
-        export NIX_LDFLAGS="$NIX_LDFLAGS -L$out/lib/xulrunner-${xulVersion}"
-
-        mkdir ../objdir
-        cd ../objdir
-        configureScript=../mozilla-release/configure
-      ''; # */
-
-    #installFlags = "SKIP_GRE_REGISTRATION=1";
-
-    postInstall = ''
-      # Fix run-mozilla.sh search
-      libDir=$(cd $out/lib && ls -d xulrunner-[0-9]*)
-      echo libDir: $libDir
-      test -n "$libDir"
-      cd $out/bin
-      rm xulrunner
-
-      for i in $out/lib/$libDir/*; do
-          file $i;
-          if file $i | grep executable &>/dev/null; then
-              echo -e '#! /bin/sh\n"'"$i"'" "$@"' > "$out/bin/$(basename "$i")";
-              chmod a+x "$out/bin/$(basename "$i")";
-          fi;
-      done
-      for i in $out/lib/$libDir/*.so; do
-          patchelf --set-rpath "$(patchelf --print-rpath "$i"):$out/lib/$libDir" $i || true
-      done
-      for i in $out/lib/$libDir/{plugin-container,xulrunner,xulrunner-stub}; do
-          wrapProgram $i --prefix LD_LIBRARY_PATH ':' "$out/lib/$libDir"
-      done
-      rm -f $out/bin/run-mozilla.sh
-    ''; # */
-
-    meta = {
-      description = "Mozilla Firefox XUL runner";
-      homepage = http://www.mozilla.com/en-US/firefox/;
-    };
-
-    passthru = { inherit gtk; version = xulVersion; };
-  };
-
-
-  firefox = stdenv.mkDerivation rec {
-    name = "firefox-${firefoxVersion}";
-
-    inherit src;
-
-    enableParallelBuilding = true;
-
-    buildInputs =
-      [ pkgconfig gtk perl zip libIDL libjpeg zlib cairo bzip2 python
-        dbus dbus_glib pango freetype fontconfig alsaLib nspr nss libnotify
-        xlibs.pixman yasm mesa sqlite file unzip pysqlite
-      ];
-
-    propagatedBuildInputs = [xulrunner];
-
-    configureFlags =
-      [ "--enable-application=browser"
-        "--with-libxul-sdk=${xulrunner}/lib/xulrunner-devel-${xulrunner.version}"
-        "--enable-chrome-format=jar"
-        "--disable-elf-hack"
-      ]
-      ++ commonConfigureFlags
-      ++ stdenv.lib.optional enableOfficialBranding "--enable-official-branding";
-
-    makeFlags = [
-      "SYSTEM_LIBXUL=1"
-    ];
-
-    # Hack to work around make's idea of -lbz2 dependency
-    preConfigure =
-      ''
-        find . -name Makefile.in -execdir sed -i '{}' -e '1ivpath %.so ${
-          stdenv.lib.concatStringsSep ":"
-            (map (s : s + "/lib") (buildInputs ++ [stdenv.gcc.libc]))
-        }' ';'
-      '';
-
-    postInstall =
-      ''
-        ln -s ${xulrunner}/lib/xulrunner-${xulrunner.version} $(echo $out/lib/firefox-*)/xulrunner
-        for j in $out/bin/*; do
-            i="$(readlink "$j")";
-            file $i;
-            if file $i | grep executable &>/dev/null; then
-                rm "$out/bin/$(basename "$i")"
-                echo -e '#! /bin/sh\nexec "'"$i"'" "$@"' > "$out/bin/$(basename "$i")"
-                chmod a+x "$out/bin/$(basename "$i")"
-            fi;
-        done;
-        cd "$out/lib/"firefox-*
-        rm firefox
-        echo -e '#!${stdenv.shell}\n${xulrunner}/bin/xulrunner "'"$PWD"'/application.ini" "$@"' > firefox
-        chmod a+x firefox
-      ''; # */
-
-    meta = {
-      description = "Mozilla Firefox - the browser, reloaded";
-      homepage = http://www.mozilla.com/en-US/firefox/;
-      maintainers = [ stdenv.lib.maintainers.eelco ];
-    };
-
-    passthru = {
-      inherit gtk xulrunner nspr;
-      isFirefox3Like = true;
-    };
-  };
-}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 4bdf9f47d14..0110f4bfa59 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7029,13 +7029,6 @@ let
 
   firefox13Wrapper = lowPrio (wrapFirefox { browser = firefox13Pkgs.firefox; });
 
-  firefox15Pkgs = callPackage ../applications/networking/browsers/firefox/15.0.nix {
-    inherit (gnome) libIDL;
-    inherit (pythonPackages) pysqlite;
-  };
-
-  firefox15Wrapper = lowPrio (wrapFirefox { browser = firefox15Pkgs.firefox; });
-
   firefox16Pkgs = callPackage ../applications/networking/browsers/firefox/16.0.nix {
     inherit (gnome) libIDL;
     inherit (pythonPackages) pysqlite;
diff --git a/pkgs/top-level/release.nix b/pkgs/top-level/release.nix
index caf5bd8aafa..1f65b22abf6 100644
--- a/pkgs/top-level/release.nix
+++ b/pkgs/top-level/release.nix
@@ -354,7 +354,6 @@ with (import ./release-lib.nix);
   };
 
   firefox36Pkgs.firefox = linux;
-  firefox15Pkgs.firefox = linux;
   firefox16Pkgs.firefox = linux;
 
   gnome = {