Modify already received Javascript in browswer
<p>Since you can modify the Javascript file when you are in Chrome and press F12, the developer tab, will anyone be able to modify the Javascript there and change the behavior of my site and therefore how it interacts with the server?</p>

<p>Reason I am asking is I want to decide whether to put a piece of code for validation (eg. check email) on the server side or the client side.</p>

<p>Thanks</p>
