mozilla-b2g/gaia — pull request #13628 by gtorodelvalle (2013-11-12 16:07:28+00:00)
Title: Bug 936283 - [B2G][Contacts] Search bar stops functioning when searching contacts in Gmail or Outlook more than once

In the importation case, the contacts.js library is not available and consequently accessing the undeclared |Contacts| variable throws a ReferenceError. There are several options to solve this, such as the one proposed ;-)