editing pages on server from clients (security feature??)

Subject:	editing pages on server from clients (security feature??)
Date:	Tue, 22 Dec 2009 10:09:57 -0800 (PST)

I found a website and scripts debugger for firefox, firebug debugger:
href="http://www.getfirebug.com/">Firebug and tried editing a page
in
place that was stored on a local server machine, apache, and I
successfully
edited it.
How can i prevent such like debuggers or editors from having access to
my
pages; a malicious surfer could do suchsame edit if i post the pages
on the
net.
Firebug

thanks

--
ich bin ein berliner