This tool will automate the creation of the browser prefixes, such as –moz, -webkit, -o, and –ms. With prefixr, you just have to code your website using the properties specified by W3C, and just leave the rest to prefixr.
By using prefixr, you can save lots of time and efforts, you are also assured that it will be done correctly, unlike if you do the manual method which is prone in typographical errors, and indeed time and effort consuming.
To enjoy the benefits of prefixr, just checkout prefixr.com, for more detailed explanation on how to use it, watch the prefixr video demo.