World Congress, Mozilla's CEO Gary Kovacs said that Firefox OS has the advantage that users need not install an app to use it. Mozilla sought to make the most of this with the search functionality built into Firefox OS, a core feature of the platform. Janne Lindqvist, a mobile security researcher at the Rutgers University WINLAB, expressed concern about the discovery mechanism of a Web-based platform, but a Mozilla spokesperson stated that Mozilla required developers to "package downloadable apps in a zip file that has been cryptographically signed by the store from which it originated, assuring that it has been reviewed." In addition, "apps coming back from search are given only limited access to device programming interfaces and applications, unless the user grants permission for further access." Ben Francis, an engineer on the Boot to Gecko and Firefox OS projects, described the changes in direction of the project from open web technologies for app development, to cheap smartphones, to connected devices; and how evaluation of its success was reduced to its market share as a third smartphone platform (after Android and iOS). Devices Officially and unofficially supported devices The structural similarities between Firefox OS and Android allow the Mozilla platform to run on a number of devices that ship with Android. While some ports of Firefox OS are hardly different from their original versions, others are heavily modified to fit the device in question. There are quite a few to note that are specifically made for Firefox OS as stated above. There are some that are designed for the developers themselves and others that are consumer-phones. There are also emulators for testing both apps and the OS itself on the desktop which are designed for both OS testing and the developers themselves. Firefox OS specific devices for developers: Geeksphone Keon Geeksphone Peak T2Mobile Flame ZTE Open ZTE Open C Firefox OS specific devices for consumers: Alcatel Onetouch FireC 4020D Alcatel Onetouch Fire E (6015X) APC Paper Cherry Mobile Ace Intex Cloud FX KDDI Fx0 Spice Fire One MI FX1 Spice Fire One Mi-FX 2 Symphony GoFox F15 Zen 105 Firefox ZTE Open II Firefox OS has been ported to the following devices: HTC Explorer Huawei Ascend G510 Huawei Ascend Y300 Ingenic JZ4780 based devices (2015) Moto G Nexus 4 Nexus 5 Nexus 7 (2013) Samsung Galaxy S6 Edge+ Sony Xperia E Sony Xperia SP Sony Xperia T2 Ultra Sony Xperia