Mozilla Firefox is one of the most popular browsers, It’s unusual to know that it’s not available for iPhone & iPad and it turns out that Mozilla wants Apple to bend iOS browser rules. Apple forbids browsers that do not use Apple’s version of WebKit. Webkit is the engine that allows browsers to make web pages in which can be found in both Safari and Chrome. Also, Safari is the only default browser for iPhone & iPad. Firefox browser is unlikely to be available for now.