Actually, it looks like there are a lot of these .ini files; I'm going to fix this more broadly in bug 1738122, and call this bug here fixed-by-webrender.
Bug 1494442 Comment 4 Edit History
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Actually, it looks like there are a lot of similarly-removable .ini files; I'm going to fix those more broadly in bug 1738122, and call this bug here fixed-by-webrender.