diff -r 000000000000 -r 6474c204b198 gfx/cairo/disable-previous-scaled-font-cache.patch
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/cairo/disable-previous-scaled-font-cache.patch	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,16 @@
+diff --git a/gfx/cairo/cairo/src/cairo.c b/gfx/cairo/cairo/src/cairo.c
+--- a/gfx/cairo/cairo/src/cairo.c
++++ b/gfx/cairo/cairo/src/cairo.c
+@@ -3201,8 +3201,12 @@ cairo_set_scaled_font (cairo_t          
+ 
+     _cairo_gstate_set_font_options (cr->gstate, &scaled_font->options);
+ 
++    /* XXX: Mozilla code assumes that the ctm of a scaled font doesn't need to
++     * match the context ctm. This assumption breaks the previous_scaled_font
++     * cache. So we avoid using the cache for now.
+     if (was_previous)
+ 	cr->gstate->scaled_font = cairo_scaled_font_reference ((cairo_scaled_font_t *) scaled_font);
++    */
+ 
+     return;
+