diff --git a/doc/release-notes/rl-2511.section.md b/doc/release-notes/rl-2511.section.md
index 494193a145f3..3a09d70d93a5 100644
--- a/doc/release-notes/rl-2511.section.md
+++ b/doc/release-notes/rl-2511.section.md
@@ -120,6 +120,8 @@
 
 - `python3Packages.triton` no longer takes an `enableRocm` argument and supports ROCm in all build configurations via runtime binding. In most cases no action will be needed. If triton is unable to find the HIP SDK add `rocmPackages.clr` as a build input or set the environment variable `HIP_PATH="${rocmPackages.clr}"`.
 
+- `floorp` has been replaced with a binary build, available as `floorp-bin`. Due to major changes in the upstream project structure and build system, building Floorp from source has become unfeasible. No configuration or state migration is necessary.
+
 - `inspircd` has been updated to the v4 release series. Please refer to the upstream documentation for [general information](https://docs.inspircd.org/4/overview/#v4-overview) and a list of [breaking changes](https://docs.inspircd.org/4/breaking-changes/).
 
 - `lima` package now only includes the guest agent for the host's architecture by default. If your guest VM's architecture differs from your Lima host's, you'll need to enable the `lima-additional-guestagents` package by setting `withAdditionalGuestAgents = true` when overriding lima with this input.
diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
index 70de75dc6355..46fa3160cb69 100644
--- a/nixos/tests/all-tests.nix
+++ b/nixos/tests/all-tests.nix
@@ -559,10 +559,6 @@ in
   flannel = runTestOn [ "x86_64-linux" ] ./flannel.nix;
   flaresolverr = runTest ./flaresolverr.nix;
   flood = runTest ./flood.nix;
-  floorp = runTest {
-    imports = [ ./firefox.nix ];
-    _module.args.firefoxPackage = pkgs.floorp;
-  };
   fluent-bit = runTest ./fluent-bit.nix;
   fluentd = runTest ./fluentd.nix;
   fluidd = runTest ./fluidd.nix;
diff --git a/pkgs/applications/networking/browsers/floorp/default.nix b/pkgs/applications/networking/browsers/floorp/default.nix
deleted file mode 100644
index 8587583633e8..000000000000
--- a/pkgs/applications/networking/browsers/floorp/default.nix
+++ /dev/null
@@ -1,77 +0,0 @@
-{
-  stdenv,
-  lib,
-  fetchFromGitHub,
-  buildMozillaMach,
-  nixosTests,
-}:
-
-(
-  (buildMozillaMach rec {
-    pname = "floorp";
-    packageVersion = "11.30.0";
-    applicationName = "Floorp";
-    binaryName = "floorp";
-    branding = "browser/branding/official";
-    requireSigning = false;
-    allowAddonSideload = true;
-
-    # Must match the contents of `browser/config/version.txt` in the source tree
-    version = "128.14.0";
-
-    src = fetchFromGitHub {
-      owner = "Floorp-Projects";
-      repo = "Floorp";
-      fetchSubmodules = true;
-      rev = "v${packageVersion}";
-      hash = "sha256-4IAN0S9JWjaGXtnRUJz3HqUm+ZWL7KmryLu8ojSXiqg=";
-    };
-
-    extraConfigureFlags = [
-      "--with-app-basename=${applicationName}"
-      "--with-unsigned-addon-scopes=app,system"
-      "--enable-proxy-bypass-protection"
-    ];
-
-    extraPostPatch = ''
-      # Fix .desktop files for PWAs generated by Floorp
-      # The executable path returned by Services.dirsvc.get() is absolute and
-      # thus is the full /nix/store/[..] path. To avoid breaking PWAs with each
-      # update, rely on `floorp` being in $PATH, as before.
-      substituteInPlace floorp/browser/base/content/modules/ssb/LinuxSupport.mjs \
-        --replace-fail 'Services.dirsvc.get("XREExeF",Ci.nsIFile).path' '"floorp"'
-    '';
-
-    updateScript = ./update.sh;
-
-    meta = {
-      description = "Fork of Firefox that seeks balance between versatility, privacy and web openness";
-      homepage = "https://floorp.app/";
-      maintainers = with lib.maintainers; [ christoph-heiss ];
-      platforms = lib.platforms.unix;
-      broken = stdenv.buildPlatform.is32bit;
-      # since Firefox 60, build on 32-bit platforms fails with "out of memory".
-      # not in `badPlatforms` because cross-compilation on 64-bit machine might work.
-      maxSilent = 14400; # 4h, double the default of 7200s (c.f. #129212, #129115)
-      license = lib.licenses.mpl20;
-      mainProgram = "floorp";
-    };
-    tests = {
-      inherit (nixosTests) floorp;
-    };
-  }).override
-  {
-    # Upstream build configuration can be found at
-    # .github/workflows/src/linux/shared/mozconfig_linux_base
-    privacySupport = true;
-    webrtcSupport = true;
-    enableOfficialBranding = false;
-    geolocationSupport = true;
-    # https://github.com/NixOS/nixpkgs/issues/418473
-    ltoSupport = false;
-  }
-).overrideAttrs
-  (prev: {
-    MOZ_DATA_REPORTING = "";
-    MOZ_TELEMETRY_REPORTING = "";
-  })
diff --git a/pkgs/applications/networking/browsers/floorp/update.sh b/pkgs/applications/networking/browsers/floorp/update.sh
deleted file mode 100755
index 4f367f29e776..000000000000
--- a/pkgs/applications/networking/browsers/floorp/update.sh
+++ /dev/null
@@ -1,38 +0,0 @@
-#!/usr/bin/env nix-shell
-#!nix-shell -i bash -p curl nix-prefetch-github jq gnused
-
-set -e
-
-owner=Floorp-Projects
-repo=Floorp
-dirname="$(dirname "$0")"
-
-updateVersion() {
-    sed -i "s/packageVersion = \"[0-9.]*\";/packageVersion = \"$1\";/g" "$dirname/default.nix"
-}
-
-updateBaseVersion() {
-    local base
-    base=$(curl -s "https://raw.githubusercontent.com/$owner/$repo/v$1/browser/config/version.txt")
-    sed -i "s/version = \"[0-9.]*\";/version = \"$base\";/g" "$dirname/default.nix"
-}
-
-updateHash() {
-    local hash
-    hash=$(nix-prefetch-github --fetch-submodules --rev "v$1" $owner $repo | jq -r .hash)
-    sed -i "s|hash = \"[a-zA-Z0-9\/+-=]*\";|hash = \"$hash\";|g" "$dirname/default.nix"
-}
-
-currentVersion=$(cd "$dirname" && nix eval --raw -f ../../../../.. floorp.version)
-
-latestTag=$(curl -s https://api.github.com/repos/Floorp-Projects/Floorp/releases/latest | jq -r ".tag_name")
-latestVersion="$(expr "$latestTag" : 'v\(.*\)')"
-
-if [[ "$currentVersion" == "$latestVersion" ]]; then
-    echo "Floorp is up-to-date: ${currentVersion}"
-    exit 0
-fi
-
-updateVersion "$latestVersion"
-updateBaseVersion "$latestVersion"
-updateHash "$latestVersion"
diff --git a/pkgs/by-name/fl/floorp-bin-unwrapped/package.nix b/pkgs/by-name/fl/floorp-bin-unwrapped/package.nix
new file mode 100644
index 000000000000..10514ec51d32
--- /dev/null
+++ b/pkgs/by-name/fl/floorp-bin-unwrapped/package.nix
@@ -0,0 +1,139 @@
+{
+  lib,
+  stdenv,
+  fetchurl,
+  wrapGAppsHook3,
+  autoPatchelfHook,
+  alsa-lib,
+  curl,
+  dbus-glib,
+  gtk3,
+  libXtst,
+  libva,
+  pciutils,
+  pipewire,
+  adwaita-icon-theme,
+  patchelfUnstable, # have to use patchelfUnstable to support --no-clobber-old-sections
+  undmg,
+  writeText,
+}:
+
+let
+  inherit (lib.importJSON ./sources.json) version sources;
+
+  binaryName = "floorp";
+  policies = {
+    DisableAppUpdate = true;
+  };
+
+  policiesJson = writeText "floorp-policies.json" (builtins.toJSON { inherit policies; });
+
+in
+stdenv.mkDerivation (finalAttrs: {
+  pname = "floorp-bin-unwrapped";
+  inherit version;
+
+  src = fetchurl {
+    inherit (sources.${stdenv.hostPlatform.system}) url sha256;
+  };
+
+  sourceRoot = lib.optional stdenv.hostPlatform.isDarwin ".";
+
+  nativeBuildInputs = [
+    wrapGAppsHook3
+  ]
+  ++ lib.optionals (!stdenv.hostPlatform.isDarwin) [
+    autoPatchelfHook
+    patchelfUnstable
+  ]
+  ++ lib.optionals stdenv.hostPlatform.isDarwin [
+    undmg
+  ];
+
+  buildInputs = lib.optionals (!stdenv.hostPlatform.isDarwin) [
+    gtk3
+    adwaita-icon-theme
+    alsa-lib
+    dbus-glib
+    libXtst
+  ];
+
+  runtimeDependencies = [
+    curl
+    pciutils
+  ]
+  ++ lib.optionals (!stdenv.hostPlatform.isDarwin) [
+    libva.out
+  ];
+
+  appendRunpaths = lib.optionals (!stdenv.hostPlatform.isDarwin) [
+    "${pipewire}/lib"
+  ];
+
+  # Firefox uses "relrhack" to manually process relocations from a fixed offset
+  patchelfFlags = [ "--no-clobber-old-sections" ];
+
+  # don't break code signing
+  dontFixup = stdenv.hostPlatform.isDarwin;
+
+  installPhase = ''
+    runHook preInstall
+  ''
+  + (
+    if stdenv.hostPlatform.isDarwin then
+      ''
+        # it's disabled, so remove these unused files
+        rm -v \
+          Floorp.app/Contents/Resources/updater.ini \
+          Floorp.app/Contents/Library/LaunchServices/org.mozilla.updater
+        rm -rvf Floorp.app/Contents/MacOS/updater.app
+
+        mkdir -p $out/Applications
+        mv Floorp.app $out/Applications/
+      ''
+    else
+      ''
+        # it's disabled, so remove these unused files
+        rm -v updater icons/updater.png updater.ini update-settings.ini
+
+        mkdir -p "$prefix/lib" "$prefix/bin"
+        cp -r . "$prefix/lib/floorp-bin-${finalAttrs.version}"
+        ln -s "$prefix/lib/floorp-bin-${finalAttrs.version}/floorp" "$out/bin/${binaryName}"
+
+        # See: https://github.com/mozilla/policy-templates/blob/master/README.md
+        mkdir -p "$out/lib/floorp-bin-${finalAttrs.version}/distribution";
+        ln -s ${policiesJson} "$out/lib/floorp-bin-${finalAttrs.version}/distribution/policies.json";
+      ''
+  )
+  + ''
+    runHook postInstall
+  '';
+
+  passthru = {
+    inherit binaryName;
+    applicationName = "Floorp";
+    libName = "floorp-bin-${finalAttrs.version}";
+    ffmpegSupport = true;
+    gssSupport = true;
+    gtk3 = gtk3;
+    updateScript = ./update.sh;
+  };
+
+  meta = {
+    changelog = "https://blog.floorp.app/en/release/${finalAttrs.version}.html";
+    description = "Fork of Firefox that seeks balance between versatility, privacy and web openness";
+    homepage = "https://floorp.app/";
+    # https://github.com/Floorp-Projects/Floorp#-floorp-license-notices-
+    license = with lib.licenses; [
+      mpl20
+      mit
+    ];
+    platforms = builtins.attrNames sources;
+    hydraPlatforms = [ ];
+    maintainers = with lib.maintainers; [
+      christoph-heiss
+    ];
+    mainProgram = "floorp";
+    sourceProvenance = with lib.sourceTypes; [ binaryNativeCode ];
+  };
+})
diff --git a/pkgs/by-name/fl/floorp-bin-unwrapped/sources.json b/pkgs/by-name/fl/floorp-bin-unwrapped/sources.json
new file mode 100644
index 000000000000..1d0457e61e1c
--- /dev/null
+++ b/pkgs/by-name/fl/floorp-bin-unwrapped/sources.json
@@ -0,0 +1,21 @@
+{
+  "version": "12.1.4",
+  "sources": {
+    "aarch64-linux": {
+      "url": "https://github.com/Floorp-Projects/Floorp/releases/download/v12.1.4/floorp-linux-aarch64.tar.xz",
+      "sha256": "3221bc1299edacf061f0c66a3543532fd67ef0b7f998f4c41b4c7f062f79685b"
+    },
+    "x86_64-linux": {
+      "url": "https://github.com/Floorp-Projects/Floorp/releases/download/v12.1.4/floorp-linux-amd64.tar.xz",
+      "sha256": "86a5d86a52f3778ca3d3b7b250c3e36820ab792232e8dd8cd4482586e9c1f2f1"
+    },
+    "aarch64-darwin": {
+      "url": "https://github.com/Floorp-Projects/Floorp/releases/download/v12.1.4/floorp-macOS-universal.dmg",
+      "sha256": "482723722b6bab68ce5353d49502b1db6d3d43d3f918de273ef8de77c5d7f03a"
+    },
+    "x86_64-darwin": {
+      "url": "https://github.com/Floorp-Projects/Floorp/releases/download/v12.1.4/floorp-macOS-universal.dmg",
+      "sha256": "482723722b6bab68ce5353d49502b1db6d3d43d3f918de273ef8de77c5d7f03a"
+    }
+  }
+}
diff --git a/pkgs/by-name/fl/floorp-bin-unwrapped/update.sh b/pkgs/by-name/fl/floorp-bin-unwrapped/update.sh
new file mode 100755
index 000000000000..5be8138e7af5
--- /dev/null
+++ b/pkgs/by-name/fl/floorp-bin-unwrapped/update.sh
@@ -0,0 +1,44 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p curl jq gnused gawk
+
+set -e
+
+dirname="$(dirname "$0")"
+currentVersion=$(nix eval --raw -f . floorp-bin-unwrapped.version)
+
+owner=Floorp-Projects
+repo=Floorp
+
+release=$(curl -s "https://api.github.com/repos/$owner/$repo/releases/latest")
+
+latestTag=$(jq -r ".tag_name" <<<"$release")
+latestVersion="$(expr "$latestTag" : 'v\(.*\)')"
+
+if [[ "$currentVersion" == "$latestVersion" ]]; then
+    echo "Floorp is up-to-date: ${currentVersion}"
+    exit 0
+fi
+
+jq '
+  {
+    version: .tag_name[1:],
+    sources: (
+      .assets
+      | map(
+          select(.name | (endswith(".tar.xz") or endswith(".dmg")))
+            | {url: .browser_download_url, sha256: (.digest | split(":").[1])}
+        )
+      | map(
+          if .url | contains("linux-aarch64") then
+            {key: "aarch64-linux", value: .}
+          elif .url | contains("linux-amd64") then
+            {key: "x86_64-linux", value: .}
+          elif .url | contains("macOS-universal") then
+            [{key: "aarch64-darwin", value: .}, {key: "x86_64-darwin", value: .}]
+          else null end
+        )
+      | flatten
+      | from_entries
+    )
+  }
+' <<<"$release" > "$dirname/sources.json"
diff --git a/pkgs/by-name/fl/floorp-bin/package.nix b/pkgs/by-name/fl/floorp-bin/package.nix
new file mode 100644
index 000000000000..0928354e1a39
--- /dev/null
+++ b/pkgs/by-name/fl/floorp-bin/package.nix
@@ -0,0 +1,8 @@
+{
+  wrapFirefox,
+  floorp-bin-unwrapped,
+}:
+
+wrapFirefox floorp-bin-unwrapped {
+  pname = "floorp-bin";
+}
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index c0a8bebea550..57c8b5c2fd42 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -912,6 +912,8 @@ mapAliases {
   flashrom-stable = flashprog; # Added 2024-03-01
   flatbuffers_2_0 = flatbuffers; # Added 2022-05-12
   flatcam = throw "flatcam has been removed because it is unmaintained since 2022 and doesn't support Python > 3.10"; # Added 2025-01-25
+  floorp = throw "floorp has been replaced with floorp-bin, as building from upstream sources has become unfeasible starting with version 12.x"; # Added 2025-09-06
+  floorp-unwrapped = throw "floorp-unwrapped has been replaced with floorp-bin-unwrapped, as building from upstream sources has become unfeasible starting with version 12.x"; # Added 2025-09-06
   flow-editor = flow-control; # Added 2025-03-05
   flut-renamer = throw "flut-renamer is unmaintained and has been removed"; # Added 2025-08-26
   flutter313 = throw "flutter313 has been removed because it isn't updated anymore, and no packages in nixpkgs use it. If you still need it, use flutter.mkFlutter to get a custom version"; # Added 2024-10-05
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 0b0531700509..2b7ee0a96cd5 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -11632,18 +11632,6 @@ with pkgs;
     ];
   };
 
-  floorp-unwrapped = import ../applications/networking/browsers/floorp {
-    inherit
-      stdenv
-      lib
-      fetchFromGitHub
-      buildMozillaMach
-      nixosTests
-      ;
-  };
-
-  floorp = wrapFirefox floorp-unwrapped { };
-
   formiko =
     with python3Packages;
     callPackage ../applications/editors/formiko {