1611056 - Windows are created as white rectangles when Firefox opens, resulting in a white flash when in dark mode

Status: REOPENED

(Core :: DOM: Core & HTML, defect)

Description

[Asif Youssuff]

Please dupe if already reported.

Reported on: https://www.reddit.com/r/firefox/comments/esf283/is_there_a_way_to_remove_this_white_flash_of/

The post has 235 net upvotes with 98% approval.

I am able to reproduce.

Steps to reproduce:

1. Enable dark mode in Windows 10
2. Launch Firefox -- or better yet, do a session restore with many windows

What happens:

Window is initially drawn as a white rectangle, then gets drawn in as a dark Firefox window.

Expected result:

Firefox shouldn't show anything (white rectangle) before a fully themed Firefox can be shown.

FWIW, I see the same issue in Chromium 81.

I do not see this issue in GNOME on Linux or in macOS, so I filed this under win32.

Comment 1

[Emma Humphries ☕️🎸🧞‍♀️✨ (she/they) [:emceeaich] (Pacific Time) use needinfo]

This appears to be a dupe of bug 1408122 which a contributor is working on.

Comment 2

[Asif Youssuff]

Attachment: 2020-05-23 03-17-46.mkv

I don't think this is a dupe of bug 1408122. I hadn't noticed this before because I don't use Windows as my primary OS, but I continue to see this on my Windows install. I also continue to see it in Chrome, FWIW.

Here is a screen recording - I opened both Chrome and Firefox Nightly, and you can see white flashes as windows open.