With the latest nightly I am seeing any browser window that is not focused get a different tab strip background color. The constant color switching is kind of disconcerting. See attached screenshot. 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I expect that this is intentional since bug 1196266 where we follow the OS title bar colours. The OS settings app for example does the same thing.

(In reply to Dave Townsend [:mossop] from comment #1) > I expect that this is intentional since bug 1196266 where we follow the OS > title bar colours. The OS settings app for example does the same thing. I don't get any title bar color changes on the windows 10 settings app. In fact, I can't find any other app on my win10 machine which does anything like this.

If you right click on the desktop, go to Personalize and then Colors on the left hand side, do you have "Title bars" checked under "Show accent color on the following surfaces". The other settings in that pane might be useful to know too.

(In reply to Dave Townsend [:mossop] from comment #3) > If you right click on the desktop, go to Personalize and then Colors on the > left hand side, do you have "Title bars" checked under "Show accent color on > the following surfaces". The other settings in that pane might be useful to > know too. Ok. That does cause the title bar to change on other apps when focus is applied. But... why does firefox do this even when I don't have the option checked? And why does firefox not use the same accent color as other apps when the setting is enabled?

Also, I get some glitches with this behavior. Try this: 1. Open two browser windows. Lets call them A and B. 2. Pin some tabs in window A. 3. Focus one of the pinned tabs in window A. 4. Focus window B. 5. Select one of the other pinned tabs in window A. I get a short flash painting the previously focused tab with the light background color before its repainted with the dark focused color.

(In reply to Ben Kelly [reviewing, but slowly][:bkelly] from comment #4) > (In reply to Dave Townsend [:mossop] from comment #3) > > If you right click on the desktop, go to Personalize and then Colors on the > > left hand side, do you have "Title bars" checked under "Show accent color on > > the following surfaces". The other settings in that pane might be useful to > > know too. > > Ok. That does cause the title bar to change on other apps when focus is > applied. > > But... why does firefox do this even when I don't have the option checked? That is probably a bug. > And why does firefox not use the same accent color as other apps when the > setting is enabled? It does for me. Sounds like you have a few different bugs going on here. Might be worth morphing this to one of them and filing new bugs for the others.

Dao, can you take a look at these issues?

Also I would note that the new "tab has activity" indicator that was just changed to match our dark theme looks quite bad when the unfocused light color is forced. See this screenshot.

(In reply to Ben Kelly [reviewing, but slowly][:bkelly] from comment #5) > Also, I get some glitches with this behavior. Try this: > > 1. Open two browser windows. Lets call them A and B. > 2. Pin some tabs in window A. > 3. Focus one of the pinned tabs in window A. > 4. Focus window B. > 5. Select one of the other pinned tabs in window A. > > I get a short flash painting the previously focused tab with the light > background color before its repainted with the dark focused color. Is this the same as bug 1379268?

Definitely related. The slowness is similar to the double paint thing I describe in comment 5. I think the changing colors when accent title is disabled is a separate bug from the slowness, though.

Comment on attachment 8884412 [details] Bug 1379173 - Don't drop the custom titlebar color in inactive windows. https://reviewboard.mozilla.org/r/155324/#review160378

Pushed by dgottwald@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/bb672269322d Don't drop the custom titlebar color in inactive windows. r=johannh

Other Windows apps do not keep the accent color in inactive windows. Why we do it? It makes it impossible to visually differentiate the active window from inactive windows. It will defeat the purpose of accent color.

(In reply to Masatoshi Kimura [:emk] from comment #14) > Other Windows apps do not keep the accent color in inactive windows. Why we > do it? It makes it impossible to visually differentiate the active window > from inactive windows. It will defeat the purpose of accent color. The patch only reverted the behavior for when there's no accent color set. :)

Thanfully, this brought an improvement: == Change summary for alert #7775 (as of July 07 2017 20:40 UTC) == Improvements: 5% tpaint summary windows10-64 opt e10s 298.24 -> 282.38 For up to date results, see: https://treeherder.mozilla.org/perf.html#/alerts?id=7775

Hi Dão can you tell me please what should we verify here? Thanks

(In reply to ovidiu boca[:Ovidiu] from comment #19) > Hi Dão can you tell me please what should we verify here? Thanks See comment 0. The title bar shouldn't lose its color in background windows. This is with accent colors in the title bar (the Windows 10 setting) disabled.

I verified this on Windows 10 with FF Nightly 57.0a1(2017-08-15) and the title bar keeps the background window color. I will mark this as verified fixed. Thanks, Dão.