Convert the `OverlayManager` class to use private fields/methods#14704

Merged

timvandermeij merged 2 commits intomozilla:masterfrom

Snuffleupagus:OverlayManager-private

Mar 23, 2022

Commits on Mar 21, 2022

Convert the `OverlayManager` class to use private fields/methods
Snuffleupagus
committed

Commits on Mar 22, 2022

Change `OverlayManager.open` to always error if the overlay is already active
Snuffleupagus
committed