<xul:panels/> that use -moz-appearance: -moz-win-glass (or -moz-win-borderless-glass) seem to be drawing both the rounded glass border and corresponding box-shadow and a rectangular border and corresponding box-shadow in the lower right of the panel. I'm seeing this in my patch for bug 455694 (tab animations). I'll upload a screenshot shortly.
Created attachment 547000 [details] screenshot of bug This is a screenshot of a <xul:panel/> with -moz-appearance: -moz-win-borderless-glass. Notice the double box shadow along the bottom and right edges of the panel and its unrounded bottom-right corner.
No longer blocks: 455694
Status: NEW → RESOLVED
Last Resolved: 7 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 458864
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