diff --git a/content/media/webaudio/AnalyserNode.cpp b/content/media/webaudio/AnalyserNode.cpp
index c3a95f78be2a..da764314f6b4 100644
--- a/content/media/webaudio/AnalyserNode.cpp
+++ b/content/media/webaudio/AnalyserNode.cpp
@@ -180,6 +180,17 @@ AnalyserNode::GetByteFrequencyData(const Uint8Array& aArray)
   }
 }
 
+void
+AnalyserNode::GetFloatTimeDomainData(const Float32Array& aArray)
+{
+  float* buffer = aArray.Data();
+  uint32_t length = std::min(aArray.Length(), mBuffer.Length());
+
+  for (uint32_t i = 0; i < length; ++i) {
+    buffer[i] = mBuffer[(i + mWriteIndex) % mBuffer.Length()];;
+  }
+}
+
 void
 AnalyserNode::GetByteTimeDomainData(const Uint8Array& aArray)
 {
diff --git a/content/media/webaudio/AnalyserNode.h b/content/media/webaudio/AnalyserNode.h
index e0c6c927e0fc..4af0a2909fc8 100644
--- a/content/media/webaudio/AnalyserNode.h
+++ b/content/media/webaudio/AnalyserNode.h
@@ -27,6 +27,7 @@ public:
 
   void GetFloatFrequencyData(const Float32Array& aArray);
   void GetByteFrequencyData(const Uint8Array& aArray);
+  void GetFloatTimeDomainData(const Float32Array& aArray);
   void GetByteTimeDomainData(const Uint8Array& aArray);
   uint32_t FftSize() const
   {
diff --git a/dom/webidl/AnalyserNode.webidl b/dom/webidl/AnalyserNode.webidl
index cb0ecad8fcf1..e6afdc58ab2b 100644
--- a/dom/webidl/AnalyserNode.webidl
+++ b/dom/webidl/AnalyserNode.webidl
@@ -12,11 +12,12 @@
 
 interface AnalyserNode : AudioNode {
 
-    // Real-time frequency-domain data 
+    // Real-time frequency-domain data
     void getFloatFrequencyData(Float32Array array);
     void getByteFrequencyData(Uint8Array array);
 
-    // Real-time waveform data 
+    // Real-time waveform data
+    void getFloatTimeDomainData(Float32Array array);
     void getByteTimeDomainData(Uint8Array array);
 
     [SetterThrows, Pure]