People always say that Linux is more secure than Windows. The main reason seems to be the general system design philosophy and the fact that users are users and not root.
One main security concern when using Windows and Internet Explorer seem to be ActiveX. Every few days I read about another kind of exploit using ActiveX, and almost always the workaround is to deactivate ActiveX. I read that so often I wonder why people bother to activate ActiveX at all. (One reason might be that the name contains "active"; another might be the windows update function.)
So the question again: does Firefox running under Ubuntu have something similar to ActiveX, in terms of security vulnerabilities?
When I say "easy" I mean that the attack does not need to exploit another component of the system to elevate user rights. For example, an exploit involving Adobe Flash will gain access to my PC using my user rights, and then proceed to exploit some known vulnerability in
X to gain root access. That is not "easy".