diff --git a/srcpkgs/firefox/patches/gmp-sandbox-musl.patch b/srcpkgs/firefox/patches/gmp-sandbox-musl.patch
new file mode 100644
index 00000000000000..767b34f78639ce
--- /dev/null
+++ b/srcpkgs/firefox/patches/gmp-sandbox-musl.patch
@@ -0,0 +1,40 @@
+diff -ruN a/dom/media/gmp/GMPLoader.cpp b/dom/media/gmp/GMPLoader.cpp
+--- a/dom/media/gmp/GMPLoader.cpp	2026-10-05 10:51:00.000000000 -0700
++++ b/dom/media/gmp/GMPLoader.cpp	2026-10-08 21:51:03.370275919 -0700
+@@ -201,6 +201,15 @@
+ #  endif
+ #endif
+ 
++#if defined(XP_LINUX) && !defined(__GLIBC__)
++  // For musl, load gcompat before loading plugins possibly distributed as
++  // glibc-linked binaries. Ignore failure to load.
++  PRLibSpec gcompat_libSpec;
++  gcompat_libSpec.type = PR_LibSpec_Pathname;
++  gcompat_libSpec.value.pathname = "libgcompat.so.0";
++  PR_LoadLibraryWithFlags(gcompat_libSpec, PR_LD_LAZY | PR_LD_GLOBAL);
++#endif
++
+   if (!getenv("MOZ_DISABLE_GMP_SANDBOX") && mSandboxStarter &&
+       !mSandboxStarter->Start(aUTF8LibPath)) {
+     MOZ_CRASH("Cannot start sandbox!");
+@@ -278,6 +287,20 @@
+   }
+   bool Start(const char* aLibPath) override {
+     RegisterProfilerObserversForSandboxProfiler();
++
++#ifndef __GLIBC__
++    // For libcs other than glibc, ensure that the emulation of the glibc
++    // dynamic linker is already loaded so that the plugin does not attempt to
++    // load it later. Ignore failure to load.
++#if defined(__i386__)
++    PR_LoadLibrary("ld-linux.so.2");
++#elif defined(__x86_64__)
++    PR_LoadLibrary("ld-linux-x86-64.so.2");
++#elif defined(__aarch64__)
++    PR_LoadLibrary("ld-linux-aarch64.so.2");
++#endif
++#endif
++
+     mozilla::SetMediaPluginSandbox(aLibPath);
+     return true;
+   }
diff --git a/srcpkgs/firefox/template b/srcpkgs/firefox/template
index e47b19720fbe82..c7fb945f2b7e71 100644
--- a/srcpkgs/firefox/template
+++ b/srcpkgs/firefox/template
@@ -4,7 +4,7 @@
 #
 pkgname=firefox
 version=157.0.1
-revision=1
+revision=2
 _llvmver=22
 build_helper="rust"
 hostmakedepends="unzip zip pkg-config perl python3
@@ -38,6 +38,10 @@ if [ "$XBPS_WORDSIZE" != "32" ]; then
 	build_options_default+=" debug"
 fi
 
+if [ "$XBPS_TARGET_LIBC" = "musl" ]; then
+	depends+=" gcompat"
+fi
+
 desc_option_lto="Enable Link Time Optimization"
 desc_option_pgo="Enable Profile-guided Optimization"
 desc_option_clang="Build with clang"