Unsigned free Firefox WebExtensions

Zotero () is a free and open-source reference management software to manage bibliographic data and related research materials, such as PDF and ePUB files. Features include web browser integration, online syncing, generation of in-text citations, footnotes, and bibliographies, integrated PDF, ePUB and HTML readers with annotation capabilities, and a note editor, as well as integration with the word processors Microsoft Word, LibreOffice Writer, OnlyOffice, and Google Docs. It was originally created at the Center for History and New Media at George Mason University and, as of 2021, is developed