diff --git a/pkgs/applications/networking/browsers/firefox/5.0.nix b/pkgs/applications/networking/browsers/firefox/5.0.nix
deleted file mode 100644
index f59d50fb6de6..000000000000
--- a/pkgs/applications/networking/browsers/firefox/5.0.nix
+++ /dev/null
@@ -1,165 +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
-
-, # 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 = "5.0.1";
-  
-  xulVersion = "5.0.1"; # this attribute is used by other packages
-
-  
-  src = fetchurl {
-    url = "http://releases.mozilla.org/pub/mozilla.org/firefox/releases/${firefoxVersion}/source/firefox-${firefoxVersion}.source.tar.bz2";
-    sha1 = "c93b3513e160d87535a9d61c5e06a6a701e9cd3e";
-  };
-
-  
-  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"
-      "--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
-	xlibs.libXext xlibs.xextproto sqlite
-      ];
-
-    configureFlags =
-      [ "--enable-application=xulrunner"
-        "--disable-javaxpcom"
-      ] ++ commonConfigureFlags;
-
-    enableParallelBuilding = true;
-      
-    # 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]))
-        }' ';'
-      '';
-
-    # !!! Temporary hack.
-    preBuild =
-      ''
-        export NIX_ENFORCE_PURITY=
-      '';
-
-    installFlags = "SKIP_GRE_REGISTRATION=1";
-
-    postInstall = ''
-      # Fix some references to /bin paths in the Xulrunner shell script.
-      substituteInPlace $out/bin/xulrunner \
-          --replace /bin/pwd "$(type -tP pwd)" \
-          --replace /bin/ls "$(type -tP ls)"
-
-      # Fix run-mozilla.sh search
-      libDir=$(cd $out/lib && ls -d xulrunner-[0-9]*)
-      echo libDir: $libDir
-      test -n "$libDir"
-      cd $out/bin
-      mv xulrunner ../lib/$libDir/
-
-      for i in $out/lib/$libDir/*; do 
-          file $i;
-          if file $i | grep executable &>/dev/null; then 
-              ln -s $i $out/bin
-          fi;
-      done;
-      rm -f $out/bin/run-mozilla.sh
-    ''; # */
-
-    meta = {
-      description = "Mozilla Firefox XUL runner";
-      homepage = http://www.mozilla.org/firefox/;
-    };
-
-    passthru = { inherit gtk; version = xulVersion; };
-  };
-
-
-  firefox = stdenv.mkDerivation rec {
-    name = "firefox-${firefoxVersion}";
-
-    inherit src;
-
-    enableParallelBuilding = true;
-      
-    buildInputs =
-      [ pkgconfig gtk perl zip libIDL libjpeg zlib cairo bzip2 python
-        dbus dbus_glib pango freetype fontconfig alsaLib nspr libnotify
-        xlibs.pixman yasm mesa sqlite
-      ];
-
-    propagatedBuildInputs = [xulrunner];
-
-    configureFlags =
-      [ "--enable-application=browser"
-        "--with-libxul-sdk=${xulrunner}/lib/xulrunner-devel-${xulrunner.version}"
-        "--enable-chrome-format=jar"
-      ]
-      ++ commonConfigureFlags
-      ++ stdenv.lib.optional enableOfficialBranding "--enable-official-branding";
-
-    # 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 $out/lib/firefox-*)/xulrunner
-      ''; # */
-
-    meta = {
-      description = "Mozilla Firefox - the browser, reloaded";
-      homepage = http://www.mozilla.org/firefox/;
-    };
-
-    passthru = {
-      inherit gtk xulrunner nspr;
-      isFirefox3Like = true;
-    };
-  };
-}
diff --git a/pkgs/applications/networking/browsers/firefox/7.0.nix b/pkgs/applications/networking/browsers/firefox/7.0.nix
deleted file mode 100644
index c4fef3dfaf24..000000000000
--- a/pkgs/applications/networking/browsers/firefox/7.0.nix
+++ /dev/null
@@ -1,184 +0,0 @@
-{ stdenv, fetchurl, pkgconfig, gtk, pango, perl, python, zip, libIDL
-, libjpeg, libpng, zlib, cairo, dbus, dbus_glib, bzip2, xlibs
-, freetype, fontconfig, file, alsaLib, nspr, nss, libnotify
-, yasm, mesa, sqlite
-
-, # If you want the resulting program to call itself "Firefox" instead
-  # of "Shiretoko" or whatever, enable this option.  However, those
-  # binaries may not be distributed without permission from the
-  # Mozilla Foundation, see
-  # http://www.mozilla.org/foundation/trademarks/.
-  enableOfficialBranding ? false
-}:
-
-assert stdenv.gcc ? libc && stdenv.gcc.libc != null;
-
-rec {
-
-  firefoxVersion = "7.0.1";
-  
-  xulVersion = "7.0.1"; # this attribute is used by other packages
-
-  
-  src = fetchurl {
-    url = "http://releases.mozilla.org/pub/mozilla.org/firefox/releases/${firefoxVersion}/source/firefox-${firefoxVersion}.source.tar.bz2";
-    sha1 = "94bbc7152832371dc0be82f411730df043c5c6ac";
-  };
-  
-  commonConfigureFlags =
-    [ "--enable-optimize"
-      "--disable-debug"
-      "--enable-strip"
-      "--with-system-jpeg"
-      "--with-system-zlib"
-      "--with-system-bz2"
-      "--with-system-nspr"
-      # "--with-system-nss"
-      # "--with-system-png" # <-- "--with-system-png won't work because the system's libpng doesn't have APNG support"
-      "--enable-system-cairo"
-      "--enable-system-sqlite"
-      "--disable-crashreporter"
-      "--disable-tests"
-      "--disable-necko-wifi" # maybe we want to enable this at some point
-      "--disable-installer" 
-      "--disable-updater"
-    ];
-
-
-  xulrunner = stdenv.mkDerivation rec {
-    name = "xulrunner-${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
-        xlibs.libXext xlibs.xextproto sqlite
-      ];
-
-    configureFlags =
-      [ "--enable-application=xulrunner"
-        "--disable-javaxpcom"
-      ] ++ commonConfigureFlags;
-
-    enableParallelBuilding = true;
-      
-    # Hack to work around make's idea of -lbz2 dependency
-    preConfigure =
-      ''
-        find . -name Makefile.in -execdir sed -i '{}' -e '1ivpath %.so ${
-          stdenv.lib.concatStringsSep ":" 
-            (map (s : s + "/lib") (buildInputs ++ [stdenv.gcc.libc]))
-        }' ';'
-        cp -i security/coreconf/Linux{2.6,3.0}.mk
-        cp -i security/coreconf/Linux{2.6,3.1}.mk
-        cp -i security/coreconf/Linux{2.6,3.2}.mk
-        cp -i security/coreconf/Linux{2.6,3.3}.mk
-
-        export NIX_LDFLAGS="$NIX_LDFLAGS -L$out/lib/xulrunner-${xulVersion}"
-      '';
-
-    # !!! Temporary hack.
-    preBuild =
-      ''
-        export NIX_ENFORCE_PURITY=
-      '';
-
-    installFlags = "SKIP_GRE_REGISTRATION=1";
-
-    postInstall = ''
-      # Fix some references to /bin paths in the Xulrunner shell script.
-      substituteInPlace $out/bin/xulrunner \
-          --replace /bin/pwd "$(type -tP pwd)" \
-          --replace /bin/ls "$(type -tP ls)"
-
-      # Fix run-mozilla.sh search
-      libDir=$(cd $out/lib && ls -d xulrunner-[0-9]*)
-      echo libDir: $libDir
-      test -n "$libDir"
-      cd $out/bin
-      mv xulrunner ../lib/$libDir/
-
-      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/{xpcshell,plugin-container,*.so}; do
-              patchelf --set-rpath "$(patchelf --print-rpath "$i"):$out/lib/$libDir" $i || true
-      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 libnotify
-        xlibs.pixman yasm mesa sqlite file
-      ];
-
-    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";
-
-    # 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\n"'"$i"'" "$@"' > "$out/bin/$(basename "$i")"
-                chmod a+x "$out/bin/$(basename "$i")"
-            fi;
-        done;
-      ''; # */
-
-    meta = {
-      description = "Mozilla Firefox - the browser, reloaded";
-      homepage = http://www.mozilla.com/en-US/firefox/;
-    };
-
-    passthru = {
-      inherit gtk xulrunner nspr;
-      isFirefox3Like = true;
-    };
-  };
-}
diff --git a/pkgs/applications/networking/browsers/firefox/9.0.nix b/pkgs/applications/networking/browsers/firefox/9.0.nix
index f14eb05899d0..32d785e76920 100644
--- a/pkgs/applications/networking/browsers/firefox/9.0.nix
+++ b/pkgs/applications/networking/browsers/firefox/9.0.nix
@@ -15,14 +15,14 @@ assert stdenv.gcc ? libc && stdenv.gcc.libc != null;
 
 rec {
 
-  firefoxVersion = "9.0b1";
+  firefoxVersion = "9.0";
   
   xulVersion = "9.0"; # this attribute is used by other packages
 
   
   src = fetchurl {
-    url = "http://ftp.mozilla.org/pub/mozilla.org/firefox/nightly/${firefoxVersion}-candidates/build1/source/firefox-${firefoxVersion}.source.tar.bz2";
-    sha256 = "0mvm0bjzghqywh54fnk5qhz7fjm5d8y952sf59ypq64bhs5dh009";
+    url = "http://releases.mozilla.org/pub/mozilla.org/firefox/releases/${firefoxVersion}/source/firefox-${firefoxVersion}.source.tar.bz2";
+    sha1 = "f79324ec6205e4c23d51d8ab2e790de1b2541657";
   };
   
   commonConfigureFlags =
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f706fcde7704..e80a33743a9c 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6676,20 +6676,6 @@ let
 
   firefox36Wrapper = wrapFirefox { browser = firefox36Pkgs.firefox; };
 
-  firefox50Pkgs = callPackage ../applications/networking/browsers/firefox/5.0.nix {
-    inherit (gtkLibs) gtk pango;
-    inherit (gnome) libIDL;
-  };
-
-  firefox50Wrapper = wrapFirefox { browser = firefox50Pkgs.firefox; };
-
-  firefox70Pkgs = callPackage ../applications/networking/browsers/firefox/7.0.nix {
-    inherit (gtkLibs) gtk pango;
-    inherit (gnome) libIDL;
-  };
-
-  firefox70Wrapper = wrapFirefox { browser = firefox70Pkgs.firefox; };
-
   firefox80Pkgs = callPackage ../applications/networking/browsers/firefox/8.0.nix {
     inherit (gtkLibs) gtk pango;
     inherit (gnome) libIDL;
@@ -6697,11 +6683,13 @@ let
 
   firefox80Wrapper = wrapFirefox { browser = firefox80Pkgs.firefox; };
 
-  firefox90bPkgs = callPackage ../applications/networking/browsers/firefox/9.0.nix {
+  firefox90Pkgs = callPackage ../applications/networking/browsers/firefox/9.0.nix {
     inherit (gtkLibs) gtk pango;
     inherit (gnome) libIDL;
   };
 
+  firefox90Wrapper = wrapFirefox { browser = firefox90Pkgs.firefox; };
+
   flac = callPackage ../applications/audio/flac { };
 
   flashplayer = flashplayer11;
diff --git a/pkgs/top-level/release.nix b/pkgs/top-level/release.nix
index 7381c23de7ef..e1976b5d7329 100644
--- a/pkgs/top-level/release.nix
+++ b/pkgs/top-level/release.nix
@@ -382,9 +382,8 @@ with (import ./release-lib.nix);
   };
 
   firefox36Pkgs.firefox = linux;
-  firefox50Pkgs.firefox = linux;
-  firefox70Pkgs.firefox = linux;
   firefox80Pkgs.firefox = linux;
+  firefox90Pkgs.firefox = linux;
 
   gnome = {
     gnome_panel = linux;