I believe they were saying Ff on ios is non-existant. However on Android it is decent and growing. I exclusively use it on android. I even have Chrome disabled.
It's perfect for doing web searches that you don't want associated with your device. If you're on your home wifi, you can probably still be tracked, but if you're on cellular I imagine it's pretty anon.
In the first version you were stuck with Yahoo! search (which is surprisingly bad), but now you can use Google.