Generic DOI translator fails

Hello,

The generic DOI translator fails ("Could Not Save Item") with Zotero 2.1b2 in Firefox 4.0b7. The error I get is:

[JavaScript Error: "Error: Permission denied to access property 'contextObject'" {file: "file:///C:/Documents%20and%20Settings//Application%20Data/Mozilla/Firefox/Profiles/ye4tntxd.default/zotero/translators/DOI.js" line: 0}]

An example of page where this problem appears is: http://onlinelibrary.wiley.com/doi/10.1002/adfm.201000960/abstract
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