 In September 2008, Thomson Reuters, the owners of EndNote, sued the Commonwealth of Virginia for and requested an injunction against competing reference management software.George Mason University's Center for History and New Media had developed Zotero, a free/open-source extension to Mozilla Firefox.Thomson Reuters alleges that the Zotero developers reverse engineered and/or decompiled EndNote, that Zotero can transform proprietary EndNote citation style files (.ens) to the open Citation Style Language format, that they host files converted in this manner, and that they abuse the "EndNote" trademark in describing this feature.