[A-Frame] Performance issues occur when having "A-blast" example opened

[Softvision-RemusDranca]

[Affected Versions]:

• Firefox Reality version 11 RC8 (076802a).

[Affected Platforms]:

• Oculus Quest - Android 7.1.1
• HTC Vive Focus - Android 7.1.2
• Pico Neo2 - Android 8.1.0

[Prerequisites]:

• The Firefox Reality browser is open.

[Steps to reproduce]:

1. Open the https://aframe.io/examples/showcase/a-blast/ example.
2. Enter and play the game for a few seconds.
3. Exit immersive mode.
4. Interact with the window and observe the behavior.

[Expected results]:

• The window is easily navigated.

[Actual results]:

• The window is hardly navigated and new windows are hardly loading.

[Notes]:

• If I close the window with the example, the audio is still playing for a few seconds.
• This issue is also influenced by the time that the device was used before reproducing this issue. The video captured is recorded after a device restart.
• The most affected device seems to be Oculus Quest and the less affected Pico Neo2, but this could also be influenced by the condition mentioned in the second note.
• The issue seems to be dismissed after a few seconds after closing the example.
• Attached is a screen recordings of the issue:
  • Screen Recording: link.

[bluemarvin]

@fernandojsg Who should we pester for WebVR/XR profiling now? I would guess a-blast is doing something bad when exiting immersive mode.