The company is based in 20 Paoli Pike, Paoli, Pennsylvania, in Greater Philadelphia, and has 21 employees. The company name originates from the children's game duck, duck, goose. Some of DuckDuckGo's source code is free software hosted at GitHub under the Apache 2.0 License, but the core is proprietary. On 21 May 2014, DuckDuckGo launched a redesigned version that focused on smarter answers and a more refined look. The new version added often requested features such as images, local search, auto-suggest and more. On 18 September 2014, Apple included DuckDuckGo in its Safari browser as an optional search engine. On 10 November 2014, Mozilla added DuckDuckGo as a search option to Firefox 33.1.