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Created attachment 8878435 [details] sidebar_dark_background.png Unlike the built-in sidebars, the webext sidebars show a dark background before the content loads. Since the content of the sidebar is unlikely to be dark, this often sudden change in brightness is very noticeable and distracting. chrome://browser/content/webext-panels.xul is using browser.css which applies the dark background color and overrides the #sidebar background color.
Status: UNCONFIRMED → NEW
Ever confirmed: true
Priority: -- → P2
Whiteboard: sidebar → sidebar, triaged
Since Bug 1196266, the dark background may be the Windows 10 accent color.
OS: Unspecified → Windows 10
See Also: → bug 1196266
Summary: Loading sidebar flashes dark background → Loading sidebar flashes dark background or Windows 10 accent color
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