2004715 - Consider adding a new 'Auto' theme combining light/dark so browser theme follows OS preferences

Status: NEW

(Enterprise Products :: Firefox, enhancement)

Description

[Simona Badau, Desktop QA]

Found in

• Firefox Enterprise 147.0a1 (Build ID: 20251205074303)

Affected versions

• Firefox Enterprise 147.0a1

Tested platforms

• Affected platforms: Windows 11 x64, Ubuntu 24.04 and macOS 26

Preconditions

• Firefox Enterprise is launched and SSO authentication has completed successfully.

Steps to reproduce

1. Change the OS theme.
2. Observe the theme applied in Firefox Enterprise.

Expected result

• Firefox Enterprise should update its theme automatically to match the OS theme.

Actual result

• The Firefox Enterprise theme does not change when the OS theme changes.
• There is no “System Theme” option available in Firefox Enterprise, so the browser remains unchanged while the OS theme switches.
• This can be confusing for users who expect the browser to follow the OS theme.

Regression range

• This is not a regression.

Comment 1

[lburuian]

Attachment: system theme in FxE

Hello,
It seems that we now have a system theme in FxE and it changes the browser theme allong with the system theme.
Should we close this one for the time being?
Thank you.

Comment 2

[Brian Thomas Smith [:bsmth]]

The System theme — auto in the screenshot switches from light to dark according to system preferences. I think the only question is if Simona expected:

• FXEnt Dark
• FxEnt Light
• FxEnt Auto <- a third, not yet existing theme

Matt, do you have context on whether this was discussed previously? Thanks

Comment 3

[Enterprise UX]

Thank you. I do not recall any past discussions on a third theme which provides theme switching based on the operating system.

Comment 4

[Simona Badau, Desktop QA]

(In reply to Brian Thomas Smith [:bsmth] from comment #2)

The System theme — auto in the screenshot switches from light to dark according to system preferences. I think the only question is if Simona expected:

• FXEnt Dark
• FxEnt Light
• FxEnt Auto <- a third, not yet existing theme

Yes, I was referring to the third theme, FXEnt Auto, which was not available at the time this report was filed.

Comment 5

[Janika Neuberger [:janika]]

I assume we'll be revisiting the themes for Nova anyway and could add a system theme in the same go?