Windows 10, current Nightly After bug 1367384 the Firefox titlebar looks wrong and alien compared to every other Windows application. All other apps use light grey or white, and Firefox is dark grey/black. After some fiddling in Windows, I found Settings->Color->More Options->Choose Default App Mode This is currently set to "Light". I think this is the default - I don't remember changing it. When I set this to "Dark", Windows' own windows and other software such as Edge uses a dark titlebar, close but not exactly the same as Firefox. It looks like this setting is what the Firefox design was intended to match. But when it is set to "Light", Firefox is, incorrectly, Dark.

The title bar is intended to be dark by default, which IMHO is a great default (making Firefox match Windows settings for Light/Dark modes is reported already as bug 1176577). And you can’t really argue that one app should abide to “all other apps”* in Windows 10 — any app, especially if it’s UWP, can color its title bar differently to the rest: the MSN apps News and Money, for example, use very vivid colors instead of the default white. IMHO, this bug is invalid. * By “all other apps”, I suspect, you’re referring to legacy Win32 programs, not something to follow when it comes to design in Windows 10…

This is working as designed, but we'll likely get a good amount of similar complaints. Stephen, can you please comment / resolve as appropriate? Thanks.

Bug 1176577 is now rather amusing, and I think the switch referred to in it is now exposed in Windows 10. What are you going to do when the user selects the dark theme? Make the titlebar white? >And you can’t really argue that one app should abide to “all other apps”* in Windows 10 I think I can argue that if I select a light theme, I expect a light theme.

(In reply to Gian-Carlo Pascutto [:gcp] from comment #3) > Bug 1176577 is now rather amusing, and I think the switch referred to in it > is now exposed in Windows 10. > > What are you going to do when the user selects the dark theme? Make the > titlebar white? No. > >And you can’t really argue that one app should abide to “all other apps”* in Windows 10 > > I think I can argue that if I select a light theme, I expect a light theme. The thing is that light is the default, so we can't necessarily infer user intent from that.

I've never really understood the need for per-application theming, Luddite that I am... Firefox Nightly offers me three built-in themes: "Default", "Light" and "Dark". But I don't want application-specific theming - I want my platform look-n-feel. Hm. I choose "Default" in the hope that's what that means: unthemed. But no, it's not: rather than "default" looking through to the platform to create itself (tricky, I guess), it's still just a preset like the others - sort of half-n-half dark and light. Dark menu bar, light toolbar... Screen shots are available in bug 1369884 but I guess everyone knows this.

We could respect the system Dark / Light settings, like we do for picking up the Title Bar color system setting, but probably not for 57. I think there might even be a bug about that already? What we have now are essentially four settings: +-------------------+ |Automatic | +-------------------+ |Light on Dark | +-------------------+ |Light | +-------------------+ |Dark | +-------------------+ Automatic being the out of the box setting that defaults to Light on Dark, but that respects some system settings like Title Bar accent color and High Contrast mode. We only list three options now though: Default, Light and Dark I think should just make it more explicit and add Automatic as the default and selecting another option would override that.

(In reply to Stephen Horlander [:shorlander] from comment #6) > We could respect the system Dark / Light settings, like we do for picking up > the Title Bar color system setting, but probably not for 57. Okay, moving this to the reserve. > I think there might even be a bug about that already? Bug 1176577.

Once bug 1466335 lands, the only thing needed here is to write a Windows-specific patch for widget/windows/nsLookAndFeel.cpp equivalent to the changes to widget/cocoa/nsLookAndFeel.mm in attachment 8986234 [details] [diff] [review] to detect when the OS is in dark mode.

This is a little outside my usual area, but I really want us to have this feature, and right now we can still be among the first to get it. So I decided to just go for it over this weekend, and I came up with something that seems to work. Patch and try push incoming shortly.

Comment on attachment 8990637 [details] Bug 1368808 - Honor the system light/dark mode setting on Windows 10. https://reviewboard.mozilla.org/r/255714/#review262628

Pushed by mhowell@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/48bb14249b06 Honor the system light/dark mode setting on Windows 10. r=jimm

Looks like something we may want to mention in 63 release notes, Matt could you nominate this bug for addition please? Thanks (https://wiki.mozilla.org/Release_Management/Release_Notes#How_to_nominate_a_bug_for_release_notes_addition.3F)

Release Note Request (optional, but appreciated) [Why is this notable]: This is new platform integration functionality that might surprise users if they see their theme change, and that very few (if any) Win32 applications are currently supporting. [Affects Firefox for Android]: No, this is Windows only. [Suggested wording]: Firefox now respects the Windows 10 dark mode setting. If you're already using a custom theme, don't worry, we won't change it. [Links (documentation, blog post, etc)]: Microsoft blog post explaining the dark mode setting: https://blogs.windows.com/windowsexperience/2016/08/08/windows-10-tip-personalize-your-pc-by-enabling-the-dark-theme/

(We probably want to relnote this together with bug 1466335, which was the macOS 10.14 version of this.)

(In reply to :Gijs (he/him) from comment #21) > (We probably want to relnote this together with bug 1466335, which was the > macOS 10.14 version of this.) Bug 1466335 is in a different release (62) so that it works when macOS 10.14 is out (which also makes relnoting somewhat moot; see bug 1466335 comment 38.)

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0 Build ID: 20180722220044 I reproduced this issue on Windows 10 x64 (Version 10.0.17134) with Nightly 63.0a1(2018-07-08). The issue is verified fixed on the latest Nightly 63.0a1( 2018-07-22). Tested also: Dark OS theme -> Light FF theme, Dark FF theme Light OS theme-> Dark FF theme; Default FF theme

Added to Nightly 63 release notes with this wording: Improved Windows 10 integration: your Firefox theme now matches your OS Dark / Light mode

How does one disable this feature? Firefox titlebar and tab bar is now pitch black rather than respecting my Windows accent color(dark gray). There is also no change in color between active/inactive windows. If I set the Firefox theme to default, it's the same as the dark Firefox theme. If I set the Windows theme to "Light" then the Firefox default theme goes back to using the Windows accent color. Windows 10 Pro x64 with the latest October update Firefox 63 64 bit Windows 10 dark theme enabled

To add to that: When I hover over "Default" when selecting a Firefox theme, the colors go back to exactly how they should be: Window accent titlebar and a light grey toolbar otherwise. The moment I click "Default" it reverts back to the all black theme.

And to add to that: I tried installing the addon from color.firefox.com to try and create a better looking theme in the mean time. When I removed the addon, the theme went back to how I it was prior to version 63 until I restarted Firefox.

Please file new bugs on any issues you found.

This is broken for me as well, when I select the default theme the titlebar turns black, still looks good when I just hover over it. Every other application respects my win10 setting of having a green titlebar, which is what firefox used to do also. I have no way to reset this back, because the light theme just has a light grey titlebar, which is not what I want either.

(In reply to jan from comment #29) > This is broken for me as well, when I select the default theme the titlebar > turns black, still looks good when I just hover over it. That's by design for now and filed as bug 1474591. > Every other application respects my win10 setting of having a green > titlebar, which is what firefox used to do also. We should get a separate bug filed specifically for the dark theme to use the system's title bar color if this is indeed how apps are supposed to behave in dark mode.