1) Install the Greasemonkey extension>>
http://downloads.mozdev.org/greasemonkey/greasemonkey_0.2.6.xpi
2) Restart Firefox
3) Go to http://rapidshare.de/files/1034529/rapidshare.user.js.html

4) Right click on rapidshare.user.js and choose "Install User Script".
5) Run FireFox.
6) From 'File' Menu click on Open File then browse to whereever you saved the 'greasemonkey.xpi' plug-in.
Open it, wait a couple seconds for the install button becomes active.
7) Click on it to install this plug-in then CLOSE FIREFOX.
8) Run FireFox again.
From the File Menu click on Open File then browse to whereever you saved the 'rapidshare.user.js'.
9) Open it.
10) Click the Tools Menu then click on Install User Script then click OK.
11) Close FireFox.

The script will let you enjoy "no wait" and multiple file downloads......!