Why must Firefox and Opera fight?

Why must we fight?
Can't we at least just put it off until we distroy Internet Explorer?
Come on! Lets team up and distroy the true evil, instead of bickering all the time about which one is better...

Firefox always had it.

So why does an extension exist then? http://sage.mozdev.org/

Firefox also has a Master Password option.

No. To get similar functionality you need something like RoboForm installed into Firefox with an adapter.