The Mozilla Toolkit is a set of APIs, built on top of Gecko, which provide advanced services to XUL applications. These services include Profile Management, Chrome Registration, Browsing History, Extension and Theme Management, Application Update Service, and Safe Mode. (More info)
Bug 757663 makes it so we iterate over mutable arrays/maps safely. Although harder to hit, we should check XPIProvider does the same. Obvious cases:
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