diff --git a/README.md b/README.md
index e72a431..c105986 100644
--- a/README.md
+++ b/README.md
@@ -11,3 +11,7 @@ The test emits a beep using device speakers that it listens for on the device's
 ## Homepage (with latency data)
 
 https://superpowered.com/webbrowserlatency
+
+## Run it locally
+
+`python3 -m http.server`
\ No newline at end of file
diff --git a/latencyMeasurer.js b/latencyMeasurer.js
index f2d2460..fe27c07 100644
--- a/latencyMeasurer.js
+++ b/latencyMeasurer.js
@@ -43,6 +43,11 @@ class latencyMeasurer {
     }
 
     processInput(left, right, _samplerate, numberOfSamples) {
+        // Possible fix for Firefox
+        /*if (!left || !right) {
+            console.error("Undefined buffers received:", { left, right });
+            return;
+        }*/
         this.rampdec = -1.0;
         this.samplerate = _samplerate;
         this.buffersize = numberOfSamples;
@@ -119,6 +124,7 @@ class latencyMeasurer {
                         this.rampdec = 1.0 / numberOfSamples;
                         this.measurementState = this.nextMeasurementState = measurementStates.waiting;
                         this.latencyMs = -1;
+                        this.samplesElapsed = 0;
                     }
                 }
                 break;
diff --git a/processor.js b/processor.js
index ca782fc..1ca73e9 100644
--- a/processor.js
+++ b/processor.js
@@ -11,6 +11,7 @@ class MyProcessor extends AudioWorkletProcessor {
     }
 
     process(inputs, outputs, parameters) {
+        if(!inputs[0].length) return
         let inBufferL = null, inBufferR = null, outBufferL = null, outBufferR = null;
         if (typeof inputs.getChannelData === 'function') {
             inBufferL = inputs.getChannelData(0);