Open Bug 1729607 Opened 3 years ago Updated 1 year ago

Firefox cannot detect Windows 10 theme or dark theme or HCM after updating to version 92.0


(Firefox :: Theme, defect)

Firefox 91
Windows 10



Accessibility Severity s4
Tracking Status
firefox-esr78 --- unaffected
firefox-esr91 --- unaffected
firefox92 --- wontfix
firefox93 --- wontfix
firefox94 --- wontfix
firefox95 --- wontfix
firefox96 --- wontfix
firefox97 --- fix-optional


(Reporter: hontonidekai, Unassigned)




(Keywords: access, regression)


(6 files)

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0

Steps to reproduce:

Firefox updated automatically from version 91.0 to 92.0

Actual results:

After Firefox updated to the latest 92.0 version, it could not detect Windows 10 themes or the user's high contrast mode. Dark theme also did not work. Websites would display a white background with dark text rather than a black background with white text. This happened to all websites. Disabling and re-enabling did nothing nor did a fresh re-install of Firefox. I was forced to uninstall Firefox and install version 91.0 in order to use high contrast mode (black background, white text).

Expected results:

After updating to the latest version, Firefox should've been able to detect Windows 10 themes and high contrast mode. It should also have been able to detect it's own dark theme. It should've been able to display websites in a dark background with white text. Unfortunately, it did not do that after the update.

The Bugbug bot thinks this bug should belong to the 'Firefox::Theme' component, and is moving the bug to that component. Please revert this change in case you think the bot is wrong.

Component: Untriaged → Theme

Hallo Mozilla!
Warum ist im Firefox 92 (Windows 10, DarkModus!) mit dem aktivierten Adon Dunkel(!) die Tabseiten(!!) hell ???
Im gegensatz zu Ff.91.02 ! Bin sehbehindert und kann nur mit dem totalen DarkModus arbeiten !
73 u. 55
DD1ER Hans

Flags: needinfo?(bhearsum)

Google translate says:

Hello Mozilla!
Why is the tab pages (!!) light in Firefox 92 (Windows 10, DarkModus!) With the activated Adon dark (!) ???
In contrast to Ff. 91.02! I am visually impaired and can only work with the total dark mode!
73 and 55
DD1ER Hans

I don't think I can help with this question.

Flags: needinfo?(bhearsum)

I was able to replicate this on windows 10 64bit

Reproduced on Firefox:
92 release
93.b2 beta
94.0a1 nightly

  • Change windows settings to high contrast mode
  • Launch firefox, open a new tab

On Mac 10.15 & Ubuntu 20: If the theme is Dark and high contrast is on, the new tab page looks dark.


Bug 1720012: Respect system colors checkbox independent of HCM r=emilio

changeset: d9e49ce806e73e010d2bbc70260bc4a0696b69b5

Severity: -- → S3
Has Regression Range: --- → yes
Has STR: --- → yes
Ever confirmed: true
Keywords: regression
OS: Unspecified → Windows 10
Regressed by: 1720012
Hardware: Unspecified → Desktop

Is this just the new tab page, or are other ff pages (I'm think about preferences, addons, etc.) also affected?
Can you post some screenshots of the current behaviour?

Also, does the behaviour change if you toggle the Use System Colors checkbox?

Flags: needinfo?(pablo.muir)
Keywords: access
Attached image dark1.jpg
Flags: needinfo?(pablo.muir)
Attached image dark2.jpg
Attached image dark3.jpg
Attached image dark4.jpg
Attached image dark5.jpg

Thanks Pablo, does that behaviour change if you toggle 'use system colors' in the about:preferences colors dialog?

Flags: needinfo?(pablo.muir)
Attached image usesystem.jpg
Flags: needinfo?(pablo.muir)

Hi morgan, sorry about not checking that !

with about:preferences > Fonts and Colors > COLORS > Use system colors

it looks dark

(In reply to Pablo from comment #13)

Hi morgan, sorry about not checking that !

with about:preferences > Fonts and Colors > COLORS > Use system colors

it looks dark

gotcha. EDIT: thanks for the screenshot! :)

:hontonidekai :hans you may want to give this a try if you're experiencing issues. You can navigate to this checkbox by going to:
about:preferences > Language and Appearance > Colors > Use System Colors

Flags: needinfo?(hontonidekai)
Flags: needinfo?(dd1er)

Der zweite Text ist nich vpn mir!!! (Betr. Registerkarte). Nur Fehler 1729607 !!
dd1er hans

Flags: needinfo?(dd1er)

Texte löschen !!!


Sorry for the confusion, does your experience change if you enable the checkbox? Or are you experiencing an issue that is different from the one Pablo captured in the screenshots?

Flags: needinfo?(dd1er)
Closed: 3 years ago
Resolution: --- → INACTIVE
Whiteboard: [access-s4]

Oops didn't mean to close that, sorry.

Resolution: INACTIVE → ---
Summary: Firefox cannot detect Windows 10 theme or dark theme after updating to version 92.0 → Firefox cannot detect Windows 10 theme or dark theme or HCM after updating to version 92.0

Clear needinfos that are pending on inactive users.

Inactive users most likely will not respond; if the missing information is essential and cannot be collected another way, the bug maybe should be closed as INCOMPLETE.

For more information, please visit auto_nag documentation.

Flags: needinfo?(hontonidekai)
Flags: needinfo?(dd1er)
Accessibility Severity: --- → s4
Whiteboard: [access-s4]
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