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Created attachment 8930045 [details] The Tab Bar color changes when Title Bar is activated.gif [Affected versions]: - Latest Nightly 59 - beta 58.0b4 - RC 57.0 - build 4 [Affected platforms]: - macOS 10.13 - Windows 10 x64 [Steps to reproduce]: 1. Enable the Title Bar (Hamburger Menu > Customize... > check Title Bar) [Expected result]: - The Tab Bar has a lighter color, it can almost be confused with the light theme. [Actual result]: - The Tab Bar has a dark color. [Regression range]: - last good build id: 20170712030204 - first bad build id: 20170713030205 Mozregression concluded that bug 1379268 might have caused the problem. [Additional notes]: - This happens with the default theme or change the settings for the way the apps are displayed from your computer.
This was done on purpose in bug 1379268, because there's a visible lag when switching otherwise. The best solution may be to draw the titlebar ourselves, though I'm happy to take other suggestions.
status-firefox57: affected → wontfix
status-firefox58: affected → fix-optional
status-firefox-esr52: --- → unaffected
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