diff -r 000000000000 -r 6474c204b198 gfx/cairo/quartz-glyph-extents.patch
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/cairo/quartz-glyph-extents.patch	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,19 @@
+--- a/gfx/cairo/cairo/src/cairo-quartz-font.c	Wed Dec 23 14:17:44 2009 -0500
++++ b/gfx/cairo/cairo/src/cairo-quartz-font.c	Wed Dec 23 20:45:00 2009 +0000
+@@ -420,6 +420,16 @@ _cairo_quartz_init_glyph_metrics (cairo_
+ 	!CGFontGetGlyphBBoxesPtr (font_face->cgFont, &glyph, 1, &bbox))
+ 	goto FAIL;
+ 
++    /* broken fonts like Al Bayan return incorrect bounds for some null characters,
++       see https://bugzilla.mozilla.org/show_bug.cgi?id=534260 */
++    if (unlikely (bbox.origin.x == -32767 &&
++                  bbox.origin.y == -32767 &&
++                  bbox.size.width == 65534 &&
++                  bbox.size.height == 65534)) {
++        bbox.origin.x = bbox.origin.y = 0;
++        bbox.size.width = bbox.size.height = 0;
++    }
++
+     status = _cairo_matrix_compute_basis_scale_factors (&font->base.scale,
+ 						  &xscale, &yscale, 1);
+     if (status)