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This never worked according to its description: it merely set the _window-class_ background-color. We neither have nor need any mechanism to give individual windows their own per-widget background color under Win32. Instead, we just set the background color to be dark grey, which is probably good enough for the few purposes for which the background brush is actually used. (Alas, this does not _quite_ include the initial white flash.) The comment in this bug about this being important for Windows dates from bug 574638, and is no longer relevant -- at least, not in the particular way it used to be. Differential Revision: https://phabricator.services.mozilla.com/D212761