I am speaking from the perspective of the end-user. Suppose I am visiting a website, which has a log divs. Most of them are displaying ads, menus, etc. but one of them is displaying the main content of the page.
Is there a way, in which I the user, using my browser, or some other tools such as Firebug etc, can view just that one div?
I believe you could use Greasemonkey to write a script for that particular website, essentially modifying the HTML on the fly. This seems to be similar example.