Fix data leble position on Firefox

c3.js

@@ -1453,11 +1453,12 @@
                 return points[0][0] + (points[2][0] - points[0][0]) / 2;
             }
         }
-        function getYForText(points, d, that) {
+        function getYForText(points, d, textElement) {
+            var box = textElement.getBBox();
             if (__axis_rotated) {
-                return (points[0][0] + points[2][0] + that.offsetHeight * 0.6) / 2;
+                return (points[0][0] + points[2][0] + box.height * 0.6) / 2;
             } else {
-                return points[2][1] + (d.value < 0 ? that.offsetHeight : isBarType(d) ? -3 : -6);
+                return points[2][1] + (d.value < 0 ? box.height : isBarType(d) ? -3 : -6);
             }
         }
 

c3.min.js

@@ -30,7 +30,7 @@ a:a.id]}function gd(a){return"pie"===z["string"===typeof a?a:a.id]}function Tb(a
 $b);return b}function id(a,b){var c=e.mouse(a),g=e.select(a),k=1*g.attr("cx"),g=1*g.attr("cy");return Math.sqrt(Math.pow(k-c[0],2)+Math.pow(g-c[1],2))<b}function jd(a){var b=e.mouse(a),c=e.select(a);a=1*c.attr("x");var g=1*c.attr("y"),c=1*c.attr("width");return a-10<b[0]&&b[0]<a+c+10&&g-10<b[1]}function Be(a,b){var c;for(c=0;c<b.length;c++)if(b[c].start<a&&a<=b[c].end)return!0;return!1}function ge(a,b){var c=!1;Object.keys(a).forEach(function(g){a[g]===b&&(c=!0)});return c}function Zb(a,b){return Math.pow(m(a.x)-
 b[0],2)+Math.pow(D(a.value)-b[1],2)}function kd(a,b,c){Ce(a,b);l.select(".selected-circles-"+b.id).selectAll(".selected-circle-"+c).data([b]).enter().append("circle").attr("class",function(){return"selected-circle selected-circle-"+c}).attr("cx",h?Ga:Fa).attr("cy",h?Fa:Ga).attr("stroke",function(){return I(b.id)}).attr("r",1.4*ab).transition().duration(100).attr("r",ab)}function ac(a,b,c){De(a,b);l.select(".selected-circles-"+b.id).selectAll(".selected-circle-"+c).transition().duration(100).attr("r",
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