There is nothing in Gnome3 like about:config. Dconf/gconf are available, but without user documentation. ("Want to add an app to the panel? Here's how..... Want to eliminate the icons from the App Overview and see a list of names? Here's how....")
Besides, almost all extensions attempt to revive Gnome2-like capabilities that were stripped out of Gnome3. The irony of that is apparent.
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