md-input along with "required" attrubute is not working properly in firefox.

[krishna2404]

• Do you want to request a feature or report a bug? => Its a bug
• What is the current behavior? => md-input along with "required" attrubute is not working properly in firefox.

Plunker: http://plnkr.co/edit/9orpJEw6qC1we0EE8cnz?p=preview

• What is the expected behavior? ==> textbox should not get red color box if its marked as required field. It should give * as coming in chrome

[davidgabrichidze]

already improved in #393, will be released in next alpha.5

[jelbourn]

Fixed in #393

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