iOS Firefox - Opening USDZ from iFrame invokes file download rather than display through AR QuickLook (#not-model-viewer)

[milesgreen]

Description

On iOS Firefox (99), when opening a USDZ from within an iFrame, it invokes the file download dialog rather than displaying through AR QuickLook.

When opening a USDZ from a top-level parent page, the 3D model is opened in AR QuickLook just fine.

Live Demo

https://usdz-iframe-test.glitch.me/

In iOS Firefox 99, try opening the USDZ link from the Child Page in the iFrame

Version

• model-viewer: ALL

Browser Affected

• Chrome, version: xx.x.xxxx.xx
• Edge
• Firefox, 99
• IE
• Safari

OS

• Android
• iOS
• Linux
• MacOS
• Windows

AR

• WebXR
• SceneViewer
• QuickLook

[milesgreen]

Issue submitted to Mozilla:
mozilla-mobile/firefox-ios#10500