diff --git a/pkgs/applications/networking/browsers/firefox/wrapper.nix b/pkgs/applications/networking/browsers/firefox/wrapper.nix
index 2b44263096b2..8256487b7518 100644
--- a/pkgs/applications/networking/browsers/firefox/wrapper.nix
+++ b/pkgs/applications/networking/browsers/firefox/wrapper.nix
@@ -8,6 +8,7 @@
 , google_talk_plugin, fribid, gnome3/*.gnome-shell*/
 , browserpass, chrome-gnome-shell, uget-integrator, plasma-browser-integration, bukubrow
 , tridactyl-native
+, fx_cast_bridge
 , udev
 , kerberos
 }:
@@ -71,6 +72,7 @@ let
           ++ lib.optional (cfg.enableGnomeExtensions or false) chrome-gnome-shell
           ++ lib.optional (cfg.enableUgetIntegrator or false) uget-integrator
           ++ lib.optional (cfg.enablePlasmaBrowserIntegration or false) plasma-browser-integration
+          ++ lib.optional (cfg.enableFXCastBridge or false) fx_cast_bridge
           ++ extraNativeMessagingHosts
         );
       libs =   lib.optional stdenv.isLinux udev
diff --git a/pkgs/tools/misc/fx_cast/default.nix b/pkgs/tools/misc/fx_cast/default.nix
new file mode 100644
index 000000000000..5fa57e830d22
--- /dev/null
+++ b/pkgs/tools/misc/fx_cast/default.nix
@@ -0,0 +1,85 @@
+{ stdenv, fetchurl, dpkg }:
+
+stdenv.mkDerivation rec {
+  pname = "fx_cast_bridge";
+  version = "0.0.5";
+
+  src = fetchurl {
+     url = "https://github.com/hensm/fx_cast/releases/download/v${version}/${pname}-${version}-x64.deb";
+     sha256 = "1qmp1d7miq7c2q8i4bhfp5ywxdngvyi7rjl6i82is2g5nhr7gbvv";
+  };
+
+  nativeBuildInputs = [ dpkg ];
+
+  unpackPhase = ''
+    runHook preUnpack
+    dpkg-deb -xv $src ./
+    runHook postUnpack
+  '';
+
+  dontBuild = true;
+  dontPatchELF = true;
+
+  installPhase = ''
+    install -DT {opt/fx_cast,$out/bin}/${pname}
+    install -DT {usr,$out}/lib/mozilla/native-messaging-hosts/${pname}.json
+
+    substituteInPlace $out/lib/mozilla/native-messaging-hosts/${pname}.json \
+      --replace {/opt/fx_cast,$out/bin}/${pname}
+  '';
+
+  # See now-cli/default.nix
+  dontStrip = true;
+  preFixup = let
+    libPath = stdenv.lib.makeLibraryPath [stdenv.cc.cc stdenv.cc.libc];
+    bin = "$out/bin/${pname}";
+  in ''
+
+    orig_size=$(stat --printf=%s ${bin})
+
+    patchelf --set-interpreter "${stdenv.cc.bintools.dynamicLinker}" ${bin}
+    patchelf --set-rpath ${libPath} ${bin}
+    chmod +x ${bin}
+
+    new_size=$(stat --printf=%s ${bin})
+
+    ###### zeit-pkg fixing starts here.
+    # we're replacing plaintext js code that looks like
+    # PAYLOAD_POSITION = '1234                  ' | 0
+    # [...]
+    # PRELUDE_POSITION = '1234                  ' | 0
+    # ^-----20-chars-----^^------22-chars------^
+    # ^-- grep points here
+    #
+    # var_* are as described above
+    # shift_by seems to be safe so long as all patchelf adjustments occur
+    # before any locations pointed to by hardcoded offsets
+
+    var_skip=20
+    var_select=22
+    shift_by=$(expr $new_size - $orig_size)
+
+    function fix_offset {
+      # $1 = name of variable to adjust
+      location=$(grep -obUam1 "$1" ${bin} | cut -d: -f1)
+      location=$(expr $location + $var_skip)
+
+      value=$(dd if=${bin} iflag=count_bytes,skip_bytes skip=$location \
+                 bs=1 count=$var_select status=none)
+      value=$(expr $shift_by + $value)
+
+      echo -n $value | dd of=${bin} bs=1 seek=$location conv=notrunc
+    }
+
+    fix_offset PAYLOAD_POSITION
+    fix_offset PRELUDE_POSITION
+
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Implementation of the Chrome Sender API (Chromecast) within Firefox";
+    homepage = https://hensm.github.io/fx_cast/;
+    license = licenses.mit;
+    maintainers = with maintainers; [ dtzWill ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index b70c6856301a..4ccb1d4669e3 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1776,6 +1776,8 @@ in
 
   fwup = callPackage ../tools/misc/fwup { };
 
+  fx_cast_bridge = callPackage ../tools/misc/fx_cast { };
+
   fzf = callPackage ../tools/misc/fzf { };
 
   fzf-zsh = callPackage ../shells/zsh/fzf-zsh { };