Many native theme elements aren't pixel aligned in some cases, leading to bluriness. See examples, often happens on scrollbars (both the thumb and the arrows), but also visible on other elements.
This looks like a superset of bug 549666 to me.
Oops! Seems I was wrong on IRC. Indeed a duplicate of 549666
Status: NEW → RESOLVED
Last Resolved: 9 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 549666
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