Zotero 2.1, released in March 2011, adds CSL 1.0 support, Firefox 4 compatibility (the minimum is Firefox 3.6), and Zotero Commons, through which materials can be uploaded to the Internet Archive.
Zotero 2.1, izdan je u ožujku 2011. godine, novosti su CSL 1,0 podrška, kompatibilsnost sa Firefox 4 (minimum je Firefox 3.6) i Zotero Commons, kroz koje materijali se mogu učitati na internet arhivu.