How safe is Edge in Windows 10 update?

I have just upgraded to Windows 10 from 8.1 while it is still free to do so. I find the browser is now Edge not Internet Explorer.

I use Norton security and have their fire wall enabled with the Microsoft one disabled. I have just heard there may be problems using Edge. Will my Norton firewall block malicious attempts to access my computer? That is my concern and if there is a problem would I need to switch off my Norton firewall and use the Microsoft one.

Thanks for any advice you can give me.