Line height not working for text in button (only in Firefox)

Found this interesting bug when I was trying to position a text inside a button or input submit. This only happen in Firefox browser.
After searching online, found the solution from below website,
http://www.cssnewbie.com/input-button-line-height-bug/#.US7N129BMQ4 (credit to Rob Glazebrook for the clear explanation and workaround ).

Hope the findings can help others who face the same problem. :)

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