Firefox on iPhone uses Webkit. It's basically a Safari skin. https://en.wikipedia.org/w/index.php?title=Firefox&oldid=1186482699#Firefox_for_iOS https://en.wik

Firefox on iPhone uses Webkit. It's basically a Safari skin. https://en.wikipedia.org/w/index.php?title=Firefox&oldid=1186482699#Firefox_for_iOS https://en.wikipedia.org/w/index.php?title=Firefox&oldid=118... > It is the first Firefox-branded browser not to use the Gecko layout engine as is used in Firefox for desktop and mobile. Apple's policies require all iOS apps that browse the web to use the built-in WebKit rendering framework and WebKit JavaScript, so using Gecko is not possible.