Many of the Firefox users may have already seen that the Mozilla co-op now forcing all Firefox users to switch to new version i.e. 3.X.X.. But the people like me are still using Firefox 2.X.X because of flexibility of the older version, and plug-in support, Still there are many plug-Inns which does not support the newer firefox. so i will be still on Firefox 2.X.X.
When Firefox 3 was launched , i uninstalled it because of same reason (compatibility with plug-in) I am waiting for all plug-in makers to make there products / plug-ins fully compatible with Firefox 3.
But remember, If you need high security switch to Firefox 3, it has best available security features. with many small and large changes like Faster loading of webpages, lesser memory requirements etc.