diff --git a/tools/profiler/core/RegisteredThread.cpp b/tools/profiler/core/RegisteredThread.cpp
index b8e1a75da8e9..8eef3728d04d 100644
--- a/tools/profiler/core/RegisteredThread.cpp
+++ b/tools/profiler/core/RegisteredThread.cpp
@@ -20,9 +20,7 @@ RacyRegisteredThread::RacyRegisteredThread(
 
 RegisteredThread::RegisteredThread(
     mozilla::profiler::ThreadRegistration& aThreadRegistration)
-    : mRacyRegisteredThread(aThreadRegistration),
-      mPlatformData(
-          AllocPlatformData(aThreadRegistration.mData.mInfo.ThreadId())) {
+    : mRacyRegisteredThread(aThreadRegistration) {
   MOZ_COUNT_CTOR(RegisteredThread);
 
   // NOTE: aThread can be null for the first thread, before the ThreadManager
@@ -35,10 +33,6 @@ size_t RegisteredThread::SizeOfIncludingThis(
     mozilla::MallocSizeOf aMallocSizeOf) const {
   size_t n = aMallocSizeOf(this);
 
-  // Measurement of the following members may be added later if DMD finds it
-  // is worthwhile:
-  // - mPlatformData
-  //
   // The following members are not measured:
   // - mThreadInfo: because it is non-owning
 
diff --git a/tools/profiler/core/RegisteredThread.h b/tools/profiler/core/RegisteredThread.h
index 5199828facae..f2e04720aafa 100644
--- a/tools/profiler/core/RegisteredThread.h
+++ b/tools/profiler/core/RegisteredThread.h
@@ -105,8 +105,6 @@ class RegisteredThread final {
 
  private:
   class RacyRegisteredThread mRacyRegisteredThread;
-
-  const UniquePlatformData mPlatformData;
 };
 
 #endif  // RegisteredThread_h
diff --git a/tools/profiler/core/platform-linux-android.cpp b/tools/profiler/core/platform-linux-android.cpp
index 045cbc74784a..7797d4658acb 100644
--- a/tools/profiler/core/platform-linux-android.cpp
+++ b/tools/profiler/core/platform-linux-android.cpp
@@ -133,27 +133,6 @@ int tgkill(pid_t tgid, pid_t tid, int signalno) {
 #  define tgkill thr_kill2
 #endif
 
-class PlatformData {
- public:
-  explicit PlatformData(ProfilerThreadId aThreadId) {
-    MOZ_ASSERT(aThreadId == profiler_current_thread_id());
-    MOZ_COUNT_CTOR(PlatformData);
-    if (clockid_t clockid;
-        pthread_getcpuclockid(pthread_self(), &clockid) == 0) {
-      mClockId = Some(clockid);
-    }
-  }
-
-  MOZ_COUNTED_DTOR(PlatformData)
-
-  // Clock Id for this profiled thread. `Nothing` if `pthread_getcpuclockid`
-  // failed (e.g., if the system doesn't support per-thread clocks).
-  Maybe<clockid_t> GetClockId() const { return mClockId; }
-
- private:
-  Maybe<clockid_t> mClockId;
-};
-
 mozilla::profiler::PlatformData::PlatformData(ProfilerThreadId aThreadId) {
   MOZ_ASSERT(aThreadId == profiler_current_thread_id());
   if (clockid_t clockid; pthread_getcpuclockid(pthread_self(), &clockid) == 0) {
diff --git a/tools/profiler/core/platform-macos.cpp b/tools/profiler/core/platform-macos.cpp
index 32ca802ce0e2..da20a7aea27d 100644
--- a/tools/profiler/core/platform-macos.cpp
+++ b/tools/profiler/core/platform-macos.cpp
@@ -34,29 +34,6 @@
 
 // this port is based off of v8 svn revision 9837
 
-class PlatformData {
- public:
-  explicit PlatformData(ProfilerThreadId aThreadId)
-      : mProfiledThread(mach_thread_self()) {
-    MOZ_COUNT_CTOR(PlatformData);
-  }
-
-  ~PlatformData() {
-    // Deallocate Mach port for thread.
-    mach_port_deallocate(mach_task_self(), mProfiledThread);
-
-    MOZ_COUNT_DTOR(PlatformData);
-  }
-
-  thread_act_t ProfiledThread() const { return mProfiledThread; }
-
- private:
-  // Note: for mProfiledThread Mach primitives are used instead of pthread's
-  // because the latter doesn't provide thread manipulation primitives required.
-  // For details, consult "Mac OS X Internals" book, Section 7.3.
-  thread_act_t mProfiledThread;
-};
-
 mozilla::profiler::PlatformData::PlatformData(ProfilerThreadId aThreadId)
     : mProfiledThread(mach_thread_self()) {}
 
diff --git a/tools/profiler/core/platform-win32.cpp b/tools/profiler/core/platform-win32.cpp
index 4e2276447827..85a240a32cde 100644
--- a/tools/profiler/core/platform-win32.cpp
+++ b/tools/profiler/core/platform-win32.cpp
@@ -73,31 +73,6 @@ static HANDLE GetRealCurrentThreadHandleForProfiling() {
   return realCurrentThreadHandle;
 }
 
-class PlatformData {
- public:
-  // Get a handle to the calling thread. This is the thread that we are
-  // going to profile. We need a real handle because we are going to use it in
-  // the sampler thread.
-  explicit PlatformData(ProfilerThreadId aThreadId)
-      : mProfiledThread(GetRealCurrentThreadHandleForProfiling()) {
-    MOZ_ASSERT(aThreadId == profiler_current_thread_id());
-    MOZ_COUNT_CTOR(PlatformData);
-  }
-
-  ~PlatformData() {
-    if (mProfiledThread != nullptr) {
-      CloseHandle(mProfiledThread);
-      mProfiledThread = nullptr;
-    }
-    MOZ_COUNT_DTOR(PlatformData);
-  }
-
-  HANDLE ProfiledThread() { return mProfiledThread; }
-
- private:
-  HANDLE mProfiledThread;
-};
-
 static_assert(
     std::is_same_v<mozilla::profiler::PlatformData::WindowsHandle, HANDLE>);
 
diff --git a/tools/profiler/core/platform.cpp b/tools/profiler/core/platform.cpp
index 7584317e19f4..7d5f87050d95 100644
--- a/tools/profiler/core/platform.cpp
+++ b/tools/profiler/core/platform.cpp
@@ -4036,12 +4036,6 @@ void SamplerThread::Run() {
 #  error "bad platform"
 #endif
 
-UniquePlatformData AllocPlatformData(ProfilerThreadId aThreadId) {
-  return UniquePlatformData(new PlatformData(aThreadId));
-}
-
-void PlatformDataDestructor::operator()(PlatformData* aData) { delete aData; }
-
 // END SamplerThread
 ////////////////////////////////////////////////////////////////////////
 
diff --git a/tools/profiler/core/platform.h b/tools/profiler/core/platform.h
index bf628d84a0a3..c03cea6c3d7b 100644
--- a/tools/profiler/core/platform.h
+++ b/tools/profiler/core/platform.h
@@ -73,18 +73,6 @@ typedef uint8_t* Address;
 // ----------------------------------------------------------------------------
 // Miscellaneous
 
-class PlatformData;
-
-// We can't new/delete the type safely without defining it
-// (-Wdelete-incomplete).  Use these to hide the details from clients.
-struct PlatformDataDestructor {
-  void operator()(PlatformData*);
-};
-
-typedef mozilla::UniquePtr<PlatformData, PlatformDataDestructor>
-    UniquePlatformData;
-UniquePlatformData AllocPlatformData(ProfilerThreadId aThreadId);
-
 namespace mozilla {
 class JSONWriter;
 }