diff --git a/.clang-format-ignore b/.clang-format-ignore
index 76ab26b11f24..f37c01fe2edc 100644
--- a/.clang-format-ignore
+++ b/.clang-format-ignore
@@ -168,7 +168,6 @@ media/openmax_il/.*
 media/webrtc/signaling/src/sdp/sipcc/.*
 media/webrtc/trunk/.*
 mfbt/double-conversion/double-conversion/.*
-mfbt/lz4/.*
 mobile/android/geckoview/src/thirdparty/.*
 modules/brotli/.*
 modules/fdlibm/.*
@@ -180,6 +179,7 @@ modules/woff2/src/.*
 modules/xz-embedded/.*
 modules/zlib/.*
 mozglue/misc/decimal/.*
+mozglue/static/lz4/.*
 mozglue/tests/glibc_printf_tests/.*
 netwerk/dns/nsIDNKitInterface.h
 netwerk/sctp/src/.*
diff --git a/.prettierignore b/.prettierignore
index 3563bbb0132b..d5a03cdfef3b 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1389,7 +1389,6 @@ media/mp4parse-rust/
 media/openmax_il/
 media/webrtc/signaling/gtest/MockCall.h
 mfbt/double-conversion/double-conversion/
-mfbt/lz4/.*
 mobile/android/android-components/components/feature/readerview/src/main/assets/extensions/readerview/readability/JSDOMParser-0.4.2.js
 mobile/android/android-components/components/feature/readerview/src/main/assets/extensions/readerview/readability/readability-0.4.2.js
 mobile/android/android-components/components/feature/readerview/src/main/assets/extensions/readerview/readability/readability-readerable-0.4.2.js
@@ -1401,6 +1400,7 @@ modules/woff2/
 modules/xz-embedded/
 modules/zlib/
 mozglue/misc/decimal/
+mozglue/static/lz4/.*
 mozglue/tests/glibc_printf_tests/
 netwerk/dns/nsIDNKitInterface.h
 netwerk/sctp/src/
diff --git a/build/sanitizers/ubsan_pointer_overflow_blacklist.txt b/build/sanitizers/ubsan_pointer_overflow_blacklist.txt
index 43b07ddae982..3989df20cd36 100644
--- a/build/sanitizers/ubsan_pointer_overflow_blacklist.txt
+++ b/build/sanitizers/ubsan_pointer_overflow_blacklist.txt
@@ -18,7 +18,7 @@ src:*/media/libvpx/libvpx/vp8/encoder/encodeframe.c
 src:*/third_party/aom/av1/common/quant_common.c
 # crashtest
 src:*/parser/expat/lib/xmlparse.c
-src:*/mfbt/lz4/lz4.c
+src:*/mozglue/static/lz4/lz4.c
 src:*/media/libogg/src/ogg_framing.c
 # mochitest gl2c dom/canvas/test/webgl-conf/generated/test_2_conformance2__reading__read-pixels-pack-parameters.html
 src:*/dom/canvas/WebGLContextGL.cpp
diff --git a/build/sanitizers/ubsan_signed_overflow_blacklist.txt b/build/sanitizers/ubsan_signed_overflow_blacklist.txt
index 06c6502887b4..d72a8b04a2fa 100644
--- a/build/sanitizers/ubsan_signed_overflow_blacklist.txt
+++ b/build/sanitizers/ubsan_signed_overflow_blacklist.txt
@@ -112,7 +112,7 @@ src:*/modules/zlib/src/*
 # Our LZ4 implementation uses overflows. By listing it here we might
 # miss some unintended overflows in that implementation, but we can't
 # check for it right now.
-src:*/mfbt/lz4.c
+src:*/mozglue/static/lz4/lz4.c
 
 # Apparently this overflows a lot, because it contains some allocators
 # that keep overflowing, not sure why. Disabling by function didn't seem
diff --git a/build/sanitizers/ubsan_unsigned_overflow_blacklist.txt b/build/sanitizers/ubsan_unsigned_overflow_blacklist.txt
index ba7e59569fb3..c7d9e2b3f09f 100644
--- a/build/sanitizers/ubsan_unsigned_overflow_blacklist.txt
+++ b/build/sanitizers/ubsan_unsigned_overflow_blacklist.txt
@@ -119,7 +119,7 @@ src:*/modules/zlib/src/*
 # Our LZ4 implementation uses overflows. By listing it here we might
 # miss some unintended overflows in that implementation, but we can't
 # check for it right now.
-src:*/mfbt/lz4/*
+src:*/mozglue/static/lz4/*
 
 # Apparently this overflows a lot, because it contains some allocators
 # that keep overflowing, not sure why. Disabling by function didn't seem
diff --git a/mfbt/moz.build b/mfbt/moz.build
index be3482a8162b..35891b9bbc68 100644
--- a/mfbt/moz.build
+++ b/mfbt/moz.build
@@ -35,7 +35,6 @@ EXPORTS.mozilla = [
     "CheckedInt.h",
     "CompactPair.h",
     "Compiler.h",
-    "Compression.h",
     "DbgMacro.h",
     "DebugOnly.h",
     "DefineEnum.h",
@@ -163,7 +162,6 @@ if CONFIG["MOZ_TSAN"]:
 UNIFIED_SOURCES += [
     "Assertions.cpp",
     "ChaosMode.cpp",
-    "Compression.cpp",
     "double-conversion/double-conversion/bignum-dtoa.cc",
     "double-conversion/double-conversion/bignum.cc",
     "double-conversion/double-conversion/cached-powers.cc",
@@ -194,22 +192,10 @@ if CONFIG["MOZ_BUILD_APP"] not in (
 
 DEFINES["IMPL_MFBT"] = True
 
-SOURCES += [
-    "lz4/lz4.c",
-    "lz4/lz4file.c",
-    "lz4/lz4frame.c",
-    "lz4/lz4hc.c",
-    "lz4/xxhash.c",
-]
-
-SOURCES["lz4/xxhash.c"].flags += ["-Wno-unused-function"]
-
 DisableStlWrapping()
 
 OS_LIBS += CONFIG["LIBATOMIC_LIBS"]
 
-DEFINES["LZ4LIB_VISIBILITY"] = ""
-
 # For RefCounted.cpp
 DEFINES["MOZ_SUPPORT_LEAKCHECKING"] = True
 
diff --git a/mozglue/moz.build b/mozglue/moz.build
index b94a86279345..1198aa69c1ff 100644
--- a/mozglue/moz.build
+++ b/mozglue/moz.build
@@ -20,6 +20,7 @@ DIRS += [
     "baseprofiler",
     "build",
     "misc",
+    "static",
 ]
 
 if CONFIG["MOZ_WIDGET_TOOLKIT"]:
diff --git a/mfbt/Compression.cpp b/mozglue/static/Compression.cpp
similarity index 100%
rename from mfbt/Compression.cpp
rename to mozglue/static/Compression.cpp
diff --git a/mfbt/Compression.h b/mozglue/static/Compression.h
similarity index 79%
rename from mfbt/Compression.h
rename to mozglue/static/Compression.h
index d9f787c0b46a..60b783afa1db 100644
--- a/mfbt/Compression.h
+++ b/mozglue/static/Compression.h
@@ -42,8 +42,7 @@ class LZ4 {
    * @param aInputSize is the input size. Max supported value is ~1.9GB
    * @return the number of bytes written in buffer |aDest|
    */
-  static MFBT_API size_t compress(const char* aSource, size_t aInputSize,
-                                  char* aDest);
+  static size_t compress(const char* aSource, size_t aInputSize, char* aDest);
 
   /**
    * Compress |aInputSize| bytes from |aSource| into an output buffer
@@ -60,9 +59,8 @@ class LZ4 {
    * @return the number of bytes written in buffer |aDest| or 0 if the
    *   compression fails
    */
-  static MFBT_API size_t compressLimitedOutput(const char* aSource,
-                                               size_t aInputSize, char* aDest,
-                                               size_t aMaxOutputSize);
+  static size_t compressLimitedOutput(const char* aSource, size_t aInputSize,
+                                      char* aDest, size_t aMaxOutputSize);
 
   /**
    * If the source stream is malformed, the function will stop decoding
@@ -81,10 +79,9 @@ class LZ4 {
    *   buffer (necessarily <= aMaxOutputSize)
    * @return true on success, false on failure
    */
-  [[nodiscard]] static MFBT_API bool decompress(const char* aSource,
-                                                size_t aInputSize, char* aDest,
-                                                size_t aMaxOutputSize,
-                                                size_t* aOutputSize);
+  [[nodiscard]] static bool decompress(const char* aSource, size_t aInputSize,
+                                       char* aDest, size_t aMaxOutputSize,
+                                       size_t* aOutputSize);
 
   /**
    * If the source stream is malformed, the function will stop decoding
@@ -105,11 +102,10 @@ class LZ4 {
    *   buffer (necessarily <= aMaxOutputSize)
    * @return true on success, false on failure
    */
-  [[nodiscard]] static MFBT_API bool decompressPartial(const char* aSource,
-                                                       size_t aInputSize,
-                                                       char* aDest,
-                                                       size_t aMaxOutputSize,
-                                                       size_t* aOutputSize);
+  [[nodiscard]] static bool decompressPartial(const char* aSource,
+                                              size_t aInputSize, char* aDest,
+                                              size_t aMaxOutputSize,
+                                              size_t* aOutputSize);
 
   /*
    * Provides the maximum size that LZ4 may output in a "worst case"
@@ -134,10 +130,10 @@ class LZ4 {
  */
 class LZ4FrameCompressionContext final {
  public:
-  MFBT_API LZ4FrameCompressionContext(int aCompressionLevel, size_t aMaxSrcSize,
-                                      bool aChecksum, bool aStableSrc = false);
+  LZ4FrameCompressionContext(int aCompressionLevel, size_t aMaxSrcSize,
+                             bool aChecksum, bool aStableSrc = false);
 
-  MFBT_API ~LZ4FrameCompressionContext();
+  ~LZ4FrameCompressionContext();
 
   size_t GetRequiredWriteBufferLength() { return mWriteBufLen; }
 
@@ -147,8 +143,7 @@ class LZ4FrameCompressionContext final {
    * @return a Result with a Span containing the frame header, or an lz4 error
    * code (size_t).
    */
-  MFBT_API Result<Span<const char>, size_t> BeginCompressing(
-      Span<char> aWriteBuffer);
+  Result<Span<const char>, size_t> BeginCompressing(Span<char> aWriteBuffer);
 
   /**
    * Continue streaming frame-based compression with the provided input.
@@ -157,8 +152,7 @@ class LZ4FrameCompressionContext final {
    * @return a Result with a Span containing compressed output, or an lz4 error
    * code (size_t).
    */
-  MFBT_API Result<Span<const char>, size_t> ContinueCompressing(
-      Span<const char> aInput);
+  Result<Span<const char>, size_t> ContinueCompressing(Span<const char> aInput);
 
   /**
    * Finalize streaming frame-based compression with the provided input.
@@ -166,7 +160,7 @@ class LZ4FrameCompressionContext final {
    * @return a Result with a Span containing compressed output and the frame
    * footer, or an lz4 error code (size_t).
    */
-  MFBT_API Result<Span<const char>, size_t> EndCompressing();
+  Result<Span<const char>, size_t> EndCompressing();
 
  private:
   LZ4F_cctx_s* mContext;
@@ -191,8 +185,8 @@ struct LZ4FrameDecompressionResult {
  */
 class LZ4FrameDecompressionContext final {
  public:
-  explicit MFBT_API LZ4FrameDecompressionContext(bool aStableDest = false);
-  MFBT_API ~LZ4FrameDecompressionContext();
+  explicit LZ4FrameDecompressionContext(bool aStableDest = false);
+  ~LZ4FrameDecompressionContext();
 
   /**
    * Decompress a buffer/part of a buffer compressed with
@@ -204,7 +198,7 @@ class LZ4FrameDecompressionContext final {
    * completely decompressed the input into the output, or an lz4 error code
    * (size_t).
    */
-  MFBT_API Result<LZ4FrameDecompressionResult, size_t> Decompress(
+  Result<LZ4FrameDecompressionResult, size_t> Decompress(
       Span<char> aOutput, Span<const char> aInput);
 
  private:
diff --git a/mfbt/lz4/LICENSE b/mozglue/static/lz4/LICENSE
similarity index 100%
rename from mfbt/lz4/LICENSE
rename to mozglue/static/lz4/LICENSE
diff --git a/mfbt/lz4/README.md b/mozglue/static/lz4/README.md
similarity index 100%
rename from mfbt/lz4/README.md
rename to mozglue/static/lz4/README.md
diff --git a/mfbt/lz4/README.mozilla b/mozglue/static/lz4/README.mozilla
similarity index 100%
rename from mfbt/lz4/README.mozilla
rename to mozglue/static/lz4/README.mozilla
diff --git a/mfbt/lz4/lz4.c b/mozglue/static/lz4/lz4.c
similarity index 100%
rename from mfbt/lz4/lz4.c
rename to mozglue/static/lz4/lz4.c
diff --git a/mfbt/lz4/lz4.h b/mozglue/static/lz4/lz4.h
similarity index 100%
rename from mfbt/lz4/lz4.h
rename to mozglue/static/lz4/lz4.h
diff --git a/mfbt/lz4/lz4file.c b/mozglue/static/lz4/lz4file.c
similarity index 100%
rename from mfbt/lz4/lz4file.c
rename to mozglue/static/lz4/lz4file.c
diff --git a/mfbt/lz4/lz4file.h b/mozglue/static/lz4/lz4file.h
similarity index 100%
rename from mfbt/lz4/lz4file.h
rename to mozglue/static/lz4/lz4file.h
diff --git a/mfbt/lz4/lz4frame.c b/mozglue/static/lz4/lz4frame.c
similarity index 100%
rename from mfbt/lz4/lz4frame.c
rename to mozglue/static/lz4/lz4frame.c
diff --git a/mfbt/lz4/lz4frame.h b/mozglue/static/lz4/lz4frame.h
similarity index 100%
rename from mfbt/lz4/lz4frame.h
rename to mozglue/static/lz4/lz4frame.h
diff --git a/mfbt/lz4/lz4frame_static.h b/mozglue/static/lz4/lz4frame_static.h
similarity index 100%
rename from mfbt/lz4/lz4frame_static.h
rename to mozglue/static/lz4/lz4frame_static.h
diff --git a/mfbt/lz4/lz4hc.c b/mozglue/static/lz4/lz4hc.c
similarity index 100%
rename from mfbt/lz4/lz4hc.c
rename to mozglue/static/lz4/lz4hc.c
diff --git a/mfbt/lz4/lz4hc.h b/mozglue/static/lz4/lz4hc.h
similarity index 100%
rename from mfbt/lz4/lz4hc.h
rename to mozglue/static/lz4/lz4hc.h
diff --git a/mfbt/lz4/xxhash.c b/mozglue/static/lz4/xxhash.c
similarity index 100%
rename from mfbt/lz4/xxhash.c
rename to mozglue/static/lz4/xxhash.c
diff --git a/mfbt/lz4/xxhash.h b/mozglue/static/lz4/xxhash.h
similarity index 100%
rename from mfbt/lz4/xxhash.h
rename to mozglue/static/lz4/xxhash.h
diff --git a/mozglue/static/moz.build b/mozglue/static/moz.build
new file mode 100644
index 000000000000..ba194f23a38c
--- /dev/null
+++ b/mozglue/static/moz.build
@@ -0,0 +1,26 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+EXPORTS.mozilla = ["Compression.h"]
+
+UNIFIED_SOURCES += [
+    "Compression.cpp",
+]
+
+SOURCES += [
+    "lz4/lz4.c",
+    "lz4/lz4file.c",
+    "lz4/lz4frame.c",
+    "lz4/lz4hc.c",
+    "lz4/xxhash.c",
+]
+
+SOURCES["lz4/xxhash.c"].flags += ["-Wno-unused-function"]
+
+DEFINES["LZ4LIB_VISIBILITY"] = ""
+
+# By putting it in js, it ends up in libxul too.
+FINAL_LIBRARY = "js"
diff --git a/tools/rewriting/ThirdPartyPaths.txt b/tools/rewriting/ThirdPartyPaths.txt
index b6cb487283e1..4551cb9b71e4 100644
--- a/tools/rewriting/ThirdPartyPaths.txt
+++ b/tools/rewriting/ThirdPartyPaths.txt
@@ -133,7 +133,6 @@ media/openmax_dl/
 media/openmax_il/
 media/webrtc/signaling/gtest/MockCall.h
 mfbt/double-conversion/double-conversion/
-mfbt/lz4/.*
 mobile/android/android-components/components/feature/readerview/src/main/assets/extensions/readerview/readability/JSDOMParser-0.4.2.js
 mobile/android/android-components/components/feature/readerview/src/main/assets/extensions/readerview/readability/readability-0.4.2.js
 mobile/android/android-components/components/feature/readerview/src/main/assets/extensions/readerview/readability/readability-readerable-0.4.2.js
@@ -145,6 +144,7 @@ modules/woff2/
 modules/xz-embedded/
 modules/zlib/
 mozglue/misc/decimal/
+mozglue/static/lz4/.*
 mozglue/tests/glibc_printf_tests/
 netwerk/dns/nsIDNKitInterface.h
 netwerk/sctp/src/