Zotero is a free, easy-to-use, open-source tool to help you collect, organize, cite, and share research. The Zotero Connector automatically senses content as you browse the web and allows you to save items to Zotero with a single click. Zotero is free and open-source reference management software to manage bibliographic data and related research materials (such as PDF files). Notable features include web browser integration, online syncing, generation of in-text citations, footnotes and bibliographies, as well as integration with the word processors Microsoft Word, LibreOffice.
Download Zotero from https://www.zotero.org/download/
1. Download the Zotero application for your operating system. If you plan to use Zotero with a word processor, close all word processing applications before running the installer.
2. When installing the Zotero connector, the option you are given depends on which browser you are using to access the page. In the example above, I used Firefox to access the Zotero site, so it prompted me to install the Firefox connector. Connectors are also available for Chrome and Opera. Use those browsers to access the Zotero page if you want to install their connectors. You can add as many connectors as you want -- they will all connect to your Zotero application.
Zotero.org
Zotero Word Plugin
Zotero Tutorial
Note: Safari 12 will no longer support Safari extensions distributed directly by developers. There is a workaround for using Zotero with Safari, but it will not have the full functionality available with other browsers. Zotero is beta-testing a Zotero connector for Safari 13. More information is available on the Zotero forum.