Firstly, Your going to have to get Firefox:
http://www.mozilla.com/en-US/
After you've installed it, you will need to get the Firefox add-on, Greasemonkey:
https://addons.mozilla.org/en-US/firefox/addon/748
Lastly, you will need to install the Rapidshare waitskipper script, which you can get here:
http://userscripts.org/scripts/source/38279.user.js
