The Tor Browser / file revision

 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;