1438143 - White flash is displayed when opening a new tab on Windows

Status: RESOLVED WORKSFORME

(Firefox :: Theme, defect, P3)

Description

[Hani Yacoub, Desktop QA]

[Affected versions]: 
Nightly 60.0a1

[Affected platforms]:
Platforms: Windows 10 x 64, Windows 10 x 32

[Steps to reproduce]:
1. Start Firefox by clicking on the desktop icon
2. Go to Options -> Language and Appearance
3. Click Colors
4. Set black for background, green for text. Override Always
5. Open new tab	

[Expected result]:
White flash when opening a new tab.

[Actual result]:
There shouldn't be any white flash when opening a new tab.

Comment 1

[Dão Gottwald [:dao]]

Could you please check if this has this worked in even older versions of Firefox / when it regressed (if this is a regression)?

Comment 2

[Hani Yacoub, Desktop QA]

Here is the regression range:

Last good revision: b8f66d5a9748677dfa266a3d143525da071b730e
First bad revision: 87e8ccdd8aa6f6b549922b4debc19a4126b7d940
Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=b8f66d5a9748677dfa266a3d143525da071b730e&tochange=87e8ccdd8aa6f6b549922b4debc19a4126b7d940

Comment 4

[Clara Guerrero ( Need Info Brindusa Tot Please)]

Hi,

I've tested this using Firefox Nightly version 75.0a1 (2020-02-12) (64-bit), Beta 74.0b2 (64-bit) and Release 73.0 (64-bit) for windows 10 pro and I’m also able to reproduce the issue. Based on this I will mark each respective flag as affected.

Best,
Clara

Comment 5

[tonank]

Still happening with Firefox 81 on Windows 10, in compatibility mode or not.
Even when I apply all the userChrome fixes I was able to find, the best thing I could get is a quicker white flash.
This really messes with my eyes at night.

Comment 6

[BugBot [:suhaib / :marco/ :calixte]]

:Mardak, since you are the author of the regressor, bug 1381569, could you take a look?

For more information, please visit BugBot documentation.

Comment 7

[Dão Gottwald [:dao]]

Hani, do you know if this is still an issue or whether we can close this?

Comment 8

[Raluca Popovici, Desktop QA]

I can reproduce this issue on Nightly 140.0a1(05-05-2025), but this time, black flash happens when you are trying to open multiple new tabs. Please see the screen recording.
Preconditions:
Open Firefox and go to Settings -> Contrast Control, select "Custom", and click on the "Manage Colors" button -> set "Green" color for Text and "Black" color for Background.

Comment 9

[Raluca Popovici, Desktop QA]

Attachment: 05.05.2025_17.32.52_REC.mp4

Comment 10

[Dão Gottwald [:dao]]

(In reply to Raluca Popovici, Desktop QA from comment #8)

I can reproduce this issue on Nightly 140.0a1(05-05-2025), but this time, black flash happens when you are trying to open multiple new tabs. Please see the screen recording.
Preconditions:
Open Firefox and go to Settings -> Contrast Control, select "Custom", and click on the "Manage Colors" button -> set "Green" color for Text and "Black" color for Background.

Okay, this seems like slightly a different issue, and not really a bug to be honest. It looks like you're opening new tab pages fast enough for it not to be preloaded yet, so you see the default background for a bit. The default background matches the new tab background though, and I believe this bug was about the backgrounds not matching.

Thanks for testing!