How the heck is Firefox better? It's slower and it's harder to search stuff, get to things faster, and just harder to use in general. Whereas, with Chrome, it's easy to search, get to things, and good to use.
It's much slower and really not that great. All of its features are on Google Chrome and with Chrome you can download themes and make it pretty along with easy little tools like instant translators and HTML practice thingees.
Plus it has the incognito window if you want to snoop on your sister's account without them knowing.