We have variety of customers displaying our 3D models on their website using iframe hosted on our cloud. Recently we have found out, that Android AR works* inside iframe only if there is explicit allowance in iframe using such code:
Sorry for the late reply. Unfortunately, there is nothing we can do on our side (except mentioning this case in the User Manual). You should modify main HTML of the application and explicitly allow “xr-spatial-tracking” feature in the iframe parameters.
As for future things that can be enabled, you might want to consult to the following list in the Mozilla docs. As I can see, there is nothing connected to XR yet, except “xr-spatial-tracking”.