Yes, you can use both and switch between the two; the latest version of Firefox is 2.0 and, if you install it, you can import your IE settings either during or after the installation.
I think you will prefer Firefox in the long run...:-)
What is ransomware and how do I protect my PC from Petya?
Microsoft Surface Studio – the artist's hands-on review
Original iPhone review
Comment mettre à jour Kodi ?