Zotero (pronounced “zoh-TAIR-oh’) is a free citation management tool that helps you:
The Microsoft Word and OpenOffice word processor plugins are bundled with Zotero and should be installed automatically for each installed word processor when you first start Zotero.
To use Zotero with Google Docs, install the browser extension for your browser.
You can reinstall the plugins later from the Cite → Word Processor Plugins pane of the Zotero preferences. If you're having trouble, see Manually Installing the Zotero Word Processor Plugin or Word Processor Plugin Troubleshooting.
If you previously installed the Firefox versions of the word processor plugins into Zotero 5.0 or Zotero Standalone 4.0, you should uninstall them from Tools → Add-ons.