I’ve put up a fresh release of Multilingual Zotero (MLZ). The new client incorporates code changes to Zotero 4.0, and is compatible with Firefox 20. There is little change in the feature set, apart from citation processor fixes that apply to all projects that make use of citeproc-js. Some adjustments remain to be made in the new version: style validation is currently disabled, but will be restored fairly soon, some of the site translators appear to need attention, and Zotero’s automatic style updating still needs to be extended to cover the MLZ styles. But for the most part, you should be able to carry on as usual following the upgrade. If you run into snags, give a shout.