İ find this add on while searching totally diffrent thing, give it a try and walla, it is perfect.
Here is the definationf rom their own.
free Firefox add-on that lets you skip all the clicking and waiting on sites like RapidShare, Zshare, MegaUpload, and Sharebee. Your downloads start instantly. Never read a music blog without it.
and i am hundred percent agree with them. You ll like it too.
Here you can get it
https://addons.mozilla.org/en-US/firefox/addon/skipscreen-incredible-rapidsha/
And here you can learn about it more
http://ww12.godownloadsongs.com/
And here a video about it
http://forums.xisto.com/no_longer_exists/