Firefox isn&#x27;t written in Swift (and Firefox isn&#x27;t hosted on Github anyway), I&#x27;m guessing that you meant <a href="https:&#x2F;&#x2F;github.com&#x2F;mozilla&#x2F;firefox-ios" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;mozilla&#x2F;firefox-ios</a> .