Nice plug-in: https://addons.mozilla.org/nl/firefox/addon/11243
It will still being maintained by Mozilla.
Next step would be we would not have the right to put ABP inside Firefox or Flock.
Who governs my desktop and whether I am urged to watch ads?
Here is a better option (also for rapidshare) you can download to download, OS independant, open source, written completely in java: http://jdownloader.org/