Re-install Safari

Hi,

I'm having issues with Safari 7.0.1 (9537.73.11) so i'd like to re-install it.

In fact, i've been using Mavericks DP and additionnal Safari betas and i think it may be why it's bugging...

Moreover, everythime i repair disk permission i'm having errors coming from Safari (ressources etc...).

So i'd like to re-install it but i don't know how to do it, uninstall first (with appzapper for instance ?) but then ? How to get the latest build etc...

Help please !