Also, if one has the extension "All-in-one-Sidebar" installed,the menu item "Multi-page" will open a sidebar with all those options right there to check out.
But,as someone else said, be careful about changing things in "about:config"

O.o
The Book of Mozilla.... what kind of cult did I get myself into -this- time.

That's interesting and useful.

Try looking up "book of Mozilla" in Wikipedia, very interesting

Creepy!