Opened md-select list won't close when click outsite/blur on firefox

[ivanhtp]

How to reproduce:
1.Open it on firefox http://codepen.io/anon/pen/qdpLdb
2.Open a select to show the items
3.Don't select any item and click outside the item list intending to close.

Only happens on firefox. Chrome and IE closes it correctly.

[ghost]

There's no such pen.

[ivanhtp]

Sorry! just edited the 1st post.