• Add a new result field: confidence score (#689). The confidence score field tells how much the agent is sure about the visitor identifier. See the API reference for more details.
• Actualize the list of DOM blockers
• Fix an error that occurs in Firefox Add-ons (#684)
• Handle missing iframe.contentWindow.document, for example in JSDOM (#686)

The visitor identifiers are compatible with version 3.2.0.