Just ask Chevrolet about the corvair and we are still paying the crusader of that one.
Seems to be a pattern. Other recent vendor/advocate hackings.
http://www.freerepublic.com/focus/f-backroom/1496008/posts
http://www.freerepublic.com/focus/f-bloggers/1446071/posts
http://www.freerepublic.com/focus/f-news/1421954/posts
http://www.freerepublic.com/focus/f-news/1488637/posts
As Firefox attracts more of a following they are having more of their security flaws exposed. It lends credence to the argument that Microsoft's popularity is why is gets hacked more often, not because is is inherently more flawed (which is not to say that they don't have plenty of bugs/poorly designed features). Simply put however, the more features a product has, the more opportunity for flaws there is.
I agree with the other poster in regards to open source, the higher the level of transparency the easier it is to find and take advantage of any flaws which might exist.
I've contributed fixes to this software. It's a piece of spaghetti Perl crap. www.twiki.org.
Just wait until Linux actually recieves a noticable marketshare ... the hackers will do the same thing to it.