Those failures appears to be small differences in text anti-aliasing in some XUL tests. I don't think this indicates a bug so I'll just add a fuzz factor for these tests manifest...
Bug 1531609 Comment 38 Edit History
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Those failures appears to be small differences in text anti-aliasing in some XUL tests. I don't think this indicates a bug so I'll just add a fuzz factor for these tests in the reftest.list manifest...