INFO

This addon automatically checks rapidshare.com links (and other file hosting) and displays their status while you simply browse the page.

Sample pictures:

Step 1:

Go here and get the Firefox Greasemonkey Addon:
https://addons.mozilla.org/en-US/firefox/addon/748

Step 2:

Go here and Install the "Rapidshare Links Checker" script:
http://userscripts.org/scripts/show/9467

Note:

If you like to have more control over your browser and his actions, there is an other script that check the links only if you press a key-combination like "STRG-O".
http://userscripts.org/scripts/show/13709