« We are excited to announce the release of Zotero 4.0 Beta 1. Zotero 4.0 is a major update over 3.0, offering many new features and bug fixes, including:
On-demand download support
Relative path support for linked files
Automatic style updating for all installed styles
Automatic journal abbreviation support
Firefox 20 compatibility (Zotero for Firefox)
«Please note: Zotero 4.0 is currently beta software, and you may encounter bugs while using it».