     @highlightTerms = true
     # @insertText is text to insert into the vomnibar input when the suggestion is selected.
     @insertText = null
+    # @deDuplicate controls whether this suggestion is a candidate for deduplication.
+    @deDuplication = true
 
     # Other options set by individual completers include:
     # - tabId (TabCompleter)

    suggestions =
      for suggestion in suggestions
        url = suggestion.shortenUrl()
        continue if seenUrls[url]
        break if count++ == @maxResults
        seenUrls[url] = suggestion


          title: tab.title
          relevancyFunction: @computeRelevancy
          tabId: tab.id
          deDuplicate: false
      onComplete suggestions

  computeRelevancy: (suggestion) ->
