--- a/security/sandbox/chromium/sandbox/linux/seccomp-bpf/trap.cc.orig	2015-09-23 09:10:08.812740571 +0200
+++ b/security/sandbox/chromium/sandbox/linux/seccomp-bpf/trap.cc	2015-09-23 09:11:38.404746155 +0200
@@ -23,6 +23,11 @@
 #include "sandbox/linux/services/android_ucontext.h"
 #endif
 
+// musl libc defines siginfo_t __si_fields instead of _sifields
+#if defined(OS_LINUX) && !defined(__GLIBC__)
+#define _sifields __si_fields
+#endif
+
 namespace {
 
 struct arch_sigsys {
--- firefox-54.0.1/security/sandbox/linux/SandboxFilter.cpp.orig	2017-07-11 07:51:56.342122784 +0000
+++ firefox-54.0.1/security/sandbox/linux/SandboxFilter.cpp	2017-07-11 08:05:27.553930300 +0000
@@ -134,6 +134,7 @@
       .Case(flags_common | CLONE_DETACHED, Allow()) // <= JB 4.2
       .Case(flags_common, Allow()) // JB 4.3 or KK 4.4
 #endif
+      .Case(flags_modern | CLONE_DETACHED, Allow()) // musl
       .Case(flags_modern, Allow()) // Android L or glibc
       .Default(failPolicy);
   }
@@ -241,6 +242,9 @@
       // Polyfill with tgkill; see above.
     case __NR_tkill:
       return Trap(TKillCompatTrap, nullptr);
+#elseif !defined(__GLIBC__)
+    case __NR_tkill:
+      return Allow();
 #endif
 
       // Yield
--- firefox-54.0.1/security/sandbox/linux/SandboxFilterUtil.h.orig	2017-07-11 08:05:38.380798447 +0000
+++ firefox-54.0.1/security/sandbox/linux/SandboxFilterUtil.h	2017-07-11 08:06:20.274911403 +0000
@@ -118,7 +118,7 @@
 #define CASES_FOR_fstatfs   case __NR_fstatfs
 #define CASES_FOR_statfs   case __NR_statfs
 #define CASES_FOR_fcntl   case __NR_fcntl
-#define CASES_FOR_getdents   case __NR_getdents
+#define CASES_FOR_getdents   case __NR_getdents64: case __NR_getdents
 #define CASES_FOR_lseek   case __NR_lseek
 #define CASES_FOR_ftruncate   case __NR_ftruncate
 #endif