Zotero is a citation management tool that allows users to collect items (books, journal articles, webpages, and newspaper articles). Once items are collected they can be saved in a cloud-based "library" that can be organized and used to generate bibiliograpic citations and provide additional research tools to use with any paper or project.
Once Zotero for Firefox is installed:
Begin using Zotero, by simply clicking on the Zotero icon, located in the lower right corner of your Firefox browser window.
A new window, your Zotero library, will pop-up across the bottom of your web browser.