Zutilo is a Zotero extension which adds several functions to Zotero, such as:
Download the zutilo.xpi file from this page. Then open Zotero, menu Tools, Add-ons, and drag and drop the xpi file you just downloaded into the Extensions window.
Then, go to the menu Tools -> Zutilo Preferences, to choose the functions you wish to use. Each time you will right-click on a reference, you will have an additional Zutilo menu with these functions.