diff --git a/src/content/extensions/svc/js/main.js b/src/content/extensions/svc/js/main.js
index be02334e2..50bcbdd1c 100644
--- a/src/content/extensions/svc/js/main.js
+++ b/src/content/extensions/svc/js/main.js
@@ -45,6 +45,37 @@ const scalabilityMode = document.querySelector('#scalabilityMode');
 const supportsSetCodecPreferences = window.RTCRtpTransceiver &&
   'setCodecPreferences' in window.RTCRtpTransceiver.prototype;
 
+const scalabilityModes = [
+  'L1T1',
+  'L1T2',
+  'L1T3',
+  'L2T1',
+  'L2T2',
+  'L2T3',
+  'L3T1',
+  'L3T2',
+  'L3T3',
+  'L2T1h',
+  'L2T2h',
+  'L2T3h',
+  'S2T1',
+  'S2T2',
+  'S2T3',
+  'S2T1h',
+  'S2T2h',
+  'S2T3h',
+  'S3T1',
+  'S3T2',
+  'S3T3',
+  'S3T1h',
+  'S3T2h',
+  'S3T3h',
+  'L2T2_KEY',
+  'L2T3_KEY',
+  'L3T2_KEY',
+  'L3T3_KEY'
+];
+
 let localStream;
 let pc1;
 let pc2;
@@ -94,10 +125,8 @@ async function start() {
       option.innerText = option.value;
       codecPreferences.appendChild(option);
     });
-    codecPreferences.addEventListener('change', (event) => {
-      const [mimeType, sdpFmtpLine] = event.target.value.split(' ');
-      const selectedCodecIndex = codecs.findIndex(c => c.mimeType === mimeType && c.sdpFmtpLine === sdpFmtpLine);
-      const selectedCodec = codecs[selectedCodecIndex];
+    codecPreferences.addEventListener('change', async (event) => {
+      const [mimeType] = event.target.value.split(' ');
       while (scalabilityMode.firstChild) {
         scalabilityMode.firstChild.remove();
       }
@@ -105,13 +134,31 @@ async function start() {
       option.value = '';
       option.innerText = 'NONE';
       scalabilityMode.appendChild(option);
-      if (selectedCodec.scalabilityModes) {
-        for (const mode of selectedCodec.scalabilityModes) {
+
+      const capabilityPromises = [];
+      for (const mode of scalabilityModes) {
+        capabilityPromises.push(navigator.mediaCapabilities.encodingInfo({
+          type: 'webrtc',
+          video: {
+            contentType: mimeType,
+            width: 640,
+            height: 480,
+            bitrate: 10000,
+            framerate: 29.97,
+            scalabilityMode: mode
+          }}));
+      }
+      const capabilityResults = await Promise.all(capabilityPromises);
+      for (let i = 0; i < scalabilityModes.length; ++i) {
+        if (capabilityResults[i].supported) {
           const option = document.createElement('option');
-          option.value = mode;
-          option.innerText = mode;
+          option.value = scalabilityModes[i];
+          option.innerText = scalabilityModes[i];
           scalabilityMode.appendChild(option);
         }
+      }
+
+      if (scalabilityMode.childElementCount > 1) {
         scalabilityMode.disabled = false;
       } else {
         scalabilityMode.disabled = true;