Firefox implementing spy-feature

As reported on several news-pages, Firefox is going to implement a »ping« that implements a new »feature« to the link-tag to send a ping out to some URL defined. This has a very bad taste to me.
What I always liked in the free software world was that not every app is sending »something« to »someone« in the net, as it's quite common in Windows apps. I remember on the last days I were using Windows (98) on a regular basis, I had some of those »personal firewalls« installed. Apps that had absolutely nothing to do with the net wanted to connect to their home-server, apps where I've selected »no internet connection« still tried to do »something« online (the last one for example was winamp).

Now, I know that the design of the world wide web is really privacy-unfriendly. Yes, you can filter out a lot of things with stuff like privoxy, but in the end, you have the only possibility to disable everything (javascript, image loading from foreign servers, cookies) and lose the possibility to use a bunch of web-services. The browser can't do much about this, as this is how the web is designed.
But still, I think this firefox »feature« is a big mistake. Especially free software applications should be much more precautious about their users privacy. I can't see a big use of it for the user. But I can think of a bunch of possibilities to misuse it.

We are always crying about the »evil ones«, the spyware-producers out there, just remember the recent buzz about the iTunes-spyware-functionality. That's perfectly right. But in the end, we need to do better in free software to provide an alternative. I hope that the firefox developers re-think about this and remove or at least disable-by-default these website-pings before their next release.