Stuck in fullscreen mode when exiting private browsing

[caseyyee]

Hardware

Oculus go

Steps to Reproduce

1. Enter private browsing mode
2. Navigate to a page with Fullscreen (eg: Youtube, watch video fullscreen)
3. Press the ( X ) icon above browser window to close private browsing mode.

Current Behavior

When returning back to regular browser, we're stuck in fullscreen mode.
Note that URL bar is present when navigating to another page, though no other controls are.

Expected Behavior

Exit out of full-screen mode, returns user back to regular browsing.

See video here:
https://imgur.com/a/jjpxkyF

Screenshot:

[cvan]

This is critical because when a user enters Fullscreen Mode in Private Browsing, the UI/chrome remains hidden, and the UI/chrome does not appear until the user forcibly exits (e.g., the Oculus logo on the Go controller) and restarts Firefox Reality.

[caseyyee]

OK tried to reproduce this and just did a test (using 453bd4a) and the behavior now is that when you exit private mode (using X), you arrive back in regular browsing in fullscreen mode.

You don't get stuck anymore, but it's still a bug.