Release Notes for v18.3.0

Fixes

• Fixed a crash when calling loadExtension on an extension directory that's missing a manifest file. #34304 (Also in 16, 17, 19)
• Fixed an issue where bounds changes were incorrectly delayed in the case where a window was moved or resized and event.preventDefault was called in either will-resize or will-move on Windows. #34284 (Also in 16, 17, 19)
• Fixed an issue where running second instances of the same application would cause a deadlock on Windows. #34295 (Also in 19)
• Fixed potential crash with WebFrameMain when navigating between cross-origin websites. #34293 (Also in 19)
• Fixed service worker registration with custom protocols. #34291 (Also in 19)