User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_8_5) AppleWebKit/537.71 (KHTML, like Gecko) Version/6.1 Safari/537.71 Steps to reproduce: Just open the attached svg in Firefox 24 or 25 on Windows 7 64 bits Actual results: Notice that the 2 white paths which separates the highlighted slice in the donut are too long, even if line's coordinates are the same as on the slice Expected results: The white lines should be within the circle/donut. Just open that svg file on Firefox 25 on Windows XP, or on OSX10.8.5, or just look at attached image "Good_FF25_OSX10_8_5.png"

Good rendering on Firefox 25 on OSX10.8.5

Bad rendering on FF25, Windows 7

Regression window(m-i) Good: http://hg.mozilla.org/integration/mozilla-inbound/rev/bbb12d0bcf49 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120521220651 Bad: http://hg.mozilla.org/integration/mozilla-inbound/rev/abbf642df562 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/15.0 Firefox/15.0a1 ID:20120521222950 Pushlog: http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=bbb12d0bcf49&tochange=abbf642df562 Regressed by: Bug 715768 FYI, Disabling Azure fix the issue.

Guessing that this is the Moz2D CG backend?

Actually, this is really old.

Can you still reproduce the issue with latest version with clean new fresh profile without any addons and plugins?