Firefox suddenly reset and turn into 17.1 and all my data gone!

So, suddenly Firefox just reset, and turn into 17.1 Ive checked the new version, my history gone, my bookmark also same. I want my history back, i need them all.. All left from the previous Firefox only a folder name Old Firefox Data at my desktop. What should i do to bring them to the Firefox 17.1 ?

Thanks for the reply..

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