diff --git a/ipc/glue/CrashReporterHost.cpp b/ipc/glue/CrashReporterHost.cpp
index 9fee9187a69e..6afb9216e92a 100644
--- a/ipc/glue/CrashReporterHost.cpp
+++ b/ipc/glue/CrashReporterHost.cpp
@@ -25,7 +25,7 @@ CrashReporterHost::CrashReporterHost(GeckoProcessType aProcessType,
       mFinalized(false) {}
 
 bool CrashReporterHost::GenerateCrashReport(base::ProcessId aPid) {
-  if (!TakeCrashedChildMinidump(aPid, nullptr)) {
+  if (!TakeCrashedChildMinidump(aPid)) {
     return false;
   }
 
@@ -35,13 +35,13 @@ bool CrashReporterHost::GenerateCrashReport(base::ProcessId aPid) {
 }
 
 RefPtr<nsIFile> CrashReporterHost::TakeCrashedChildMinidump(
-    base::ProcessId aPid, uint32_t* aOutSequence) {
+    base::ProcessId aPid) {
   CrashReporter::AnnotationTable annotations;
   MOZ_ASSERT(!HasMinidump());
 
   RefPtr<nsIFile> crashDump;
   if (!CrashReporter::TakeMinidumpForChild(aPid, getter_AddRefs(crashDump),
-                                           annotations, aOutSequence)) {
+                                           annotations)) {
     return nullptr;
   }
   if (!AdoptMinidump(crashDump, annotations)) {
diff --git a/ipc/glue/CrashReporterHost.h b/ipc/glue/CrashReporterHost.h
index ed6fcb801f68..22900453603b 100644
--- a/ipc/glue/CrashReporterHost.h
+++ b/ipc/glue/CrashReporterHost.h
@@ -38,8 +38,7 @@ class CrashReporterHost {
 
   // Given an existing minidump for a crashed child process, take ownership of
   // it from IPDL. After this, FinalizeCrashReport may be called.
-  RefPtr<nsIFile> TakeCrashedChildMinidump(base::ProcessId aPid,
-                                           uint32_t* aOutSequence);
+  RefPtr<nsIFile> TakeCrashedChildMinidump(base::ProcessId aPid);
 
   // Replace the stored minidump with a new one. After this,
   // FinalizeCrashReport may be called.
diff --git a/toolkit/crashreporter/nsDummyExceptionHandler.cpp b/toolkit/crashreporter/nsDummyExceptionHandler.cpp
index 31aba8c4550a..fb7a6005c8a0 100644
--- a/toolkit/crashreporter/nsDummyExceptionHandler.cpp
+++ b/toolkit/crashreporter/nsDummyExceptionHandler.cpp
@@ -222,7 +222,7 @@ bool CreateNotificationPipeForChild(int* childCrashFd, int* childCrashRemapFd) {
 bool SetRemoteExceptionHandler(const char* aCrashPipe) { return false; }
 
 bool TakeMinidumpForChild(uint32_t childPid, nsIFile** dump,
-                          AnnotationTable& aAnnotations, uint32_t* aSequence) {
+                          AnnotationTable& aAnnotations) {
   return false;
 }
 
diff --git a/toolkit/crashreporter/nsExceptionHandler.cpp b/toolkit/crashreporter/nsExceptionHandler.cpp
index 8a36fa9341b2..047c915f5b0d 100644
--- a/toolkit/crashreporter/nsExceptionHandler.cpp
+++ b/toolkit/crashreporter/nsExceptionHandler.cpp
@@ -288,18 +288,14 @@ static FileHandle gMagicChildCrashReportFd =
 static Mutex* dumpMapLock;
 struct ChildProcessData : public nsUint32HashKey {
   explicit ChildProcessData(KeyTypePointer aKey)
-      : nsUint32HashKey(aKey), sequence(0), annotations(nullptr) {}
+      : nsUint32HashKey(aKey), annotations(nullptr) {}
 
   nsCOMPtr<nsIFile> minidump;
-  // Each crashing process is assigned an increasing sequence number to
-  // indicate which process crashed first.
-  uint32_t sequence;
   UniquePtr<AnnotationTable> annotations;
 };
 
 typedef nsTHashtable<ChildProcessData> ChildMinidumpMap;
 static ChildMinidumpMap* pidToMinidump;
-static uint32_t crashSequence;
 static bool OOPInitialized();
 
 void RecordMainThreadId() {
@@ -3364,7 +3360,6 @@ static void OnChildProcessDumpRequested(
     ChildProcessData* pd = pidToMinidump->PutEntry(pid);
     MOZ_ASSERT(!pd->minidump);
     pd->minidump = minidump;
-    pd->sequence = ++crashSequence;
     pd->annotations = MakeUnique<AnnotationTable>();
     AnnotationTable& annotations = *(pd->annotations);
     AddSharedAnnotations(annotations);
@@ -3582,7 +3577,7 @@ void GetAnnotation(uint32_t childPid, Annotation annotation,
 }
 
 bool TakeMinidumpForChild(uint32_t childPid, nsIFile** dump,
-                          AnnotationTable& aAnnotations, uint32_t* aSequence) {
+                          AnnotationTable& aAnnotations) {
   if (!GetEnabled()) return false;
 
   MutexAutoLock lock(*dumpMapLock);
@@ -3593,10 +3588,6 @@ bool TakeMinidumpForChild(uint32_t childPid, nsIFile** dump,
   NS_IF_ADDREF(*dump = pd->minidump);
   aAnnotations = *(pd->annotations);
 
-  if (aSequence) {
-    *aSequence = pd->sequence;
-  }
-
   pidToMinidump->RemoveEntry(pd);
 
   return !!*dump;
@@ -3637,7 +3628,7 @@ bool FinalizeOrphanedMinidump(uint32_t aChildPid, GeckoProcessType aType,
 #  pragma section("mozwerpt", read, executable, shared)
 
 __declspec(allocate("mozwerpt")) MOZ_EXPORT DWORD WINAPI
-    WerNotifyProc(LPVOID aParameter) {
+WerNotifyProc(LPVOID aParameter) {
   const WindowsErrorReportingData* werData =
       static_cast<const WindowsErrorReportingData*>(aParameter);
 
@@ -3668,7 +3659,6 @@ __declspec(allocate("mozwerpt")) MOZ_EXPORT DWORD WINAPI
     ChildProcessData* pd = pidToMinidump->PutEntry(pid);
     MOZ_ASSERT(!pd->minidump);
     pd->minidump = minidump;
-    pd->sequence = ++crashSequence;
     pd->annotations = MakeUnique<AnnotationTable>();
     (*pd->annotations)[Annotation::WindowsErrorReporting] = "1"_ns;
     AddSharedAnnotations(*(pd->annotations));
diff --git a/toolkit/crashreporter/nsExceptionHandler.h b/toolkit/crashreporter/nsExceptionHandler.h
index 553de4b27c06..7a6bae5ac668 100644
--- a/toolkit/crashreporter/nsExceptionHandler.h
+++ b/toolkit/crashreporter/nsExceptionHandler.h
@@ -209,11 +209,9 @@ void OOPInit();
 // Return true if a dump was found for |childPid|, and return the
 // path in |dump|.  The caller owns the last reference to |dump| if it
 // is non-nullptr. The annotations for the crash will be stored in
-// |aAnnotations|. The sequence parameter will be filled with an ordinal
-// indicating which remote process crashed first.
+// |aAnnotations|.
 bool TakeMinidumpForChild(uint32_t childPid, nsIFile** dump,
-                          AnnotationTable& aAnnotations,
-                          uint32_t* aSequence = nullptr);
+                          AnnotationTable& aAnnotations);
 
 /**
  * If a dump was found for |childPid| then write a minimal .extra file to