[Intermittent] The on-screen controls display the pause button instead of the play button when entering immersive mode before playing a video

[heres-maria-sv-inactive]

[Affected Versions]:

• Firefox Reality version 8-33452219 (bfee54e)

[Affected Platforms]:

• HTC Vive Focus Plus - Android 7.1.2
• Oculus Quest - Android 7.1.1

[Prerequisites]:

• The headset is turned on and the browser is open.
• “Autoplay Media” is set to “Off”.

[Steps to reproduce]:

1. Go to a YouTube 360 video but do not play it.
2. Enter immersive mode by clicking the full screen button.
3. Press the trigger button to display the on-screen controls.
4. Observe the play/pause button.

[Expected results]:

• The play button is displayed.

[Actual results]:

• The pause button is displayed.

[Notes]:

• The issue is not reproducible on other websites (e.g. Vimeo) due to a possible issue related to the “Autoplay Media” setting.
• Attached is a recording of this issue.

[heres-maria-sv-inactive]

I have verified that this issue is no longer reproducible with the latest Firefox Reality version 8-33521753 (379b8f1) installed on the Oculus Go, Quest, HTC Vive Focus and Focus Plus headsets.
The play button appears even when entering immersive mode before playing a video.
While verifying this issue I encountered a bug related to the functionality of the play button that is documented in #2504.