PR feedback to harden FxR check

src/utils/vr-caps-detect.js

@@ -50,7 +50,7 @@ export async function getAvailableVREntryTypes() {
   // This needs to be kept up-to-date with the latest browsers that can support VR and Hubs.
   // Checking for navigator.getVRDisplays always passes b/c of polyfill.
   const isWebVRCapableBrowser = window.hasNativeWebVRImplementation;
-  const isFirefoxReality = "buildID" in navigator && isWebVRCapableBrowser;
+  const isFirefoxReality = window.orientation === 0 && "buildID" in navigator && isWebVRCapableBrowser;
   const isInHMD = isOculusBrowser || isFirefoxReality;
 
   const isDaydreamCapableBrowser = !!(isWebVRCapableBrowser && browser.name === "chrome" && !isSamsungBrowser);