Hi
Cynh - you've been here a while (2012) but not many posts - welcome!
Tells us which iPad you own and what iOS is installed, i.e. you may need to do some iOS updating depending on your device's model - as you likely know
Safari is part of the Apple operating system on these devices - that is what I (and many others) use - have you given that browser a try? If so, do you have issues or complaints? Plenty of other browsers will work on the iPad depending on your needs and preferences, so please provide us some more information concerning why you specifically mentioned
Firefox - Dave