The Comodo Guide On How Not To Make A 'Secure' Browser

from here

I'm not going to go so far as to say Comodo had no business making an alternate browser, but they did screw it up and that's a lesson many can learn from. Creating an alternate browser, even if only by modifying an existing one, isn't as easy as it might seem. In fact it's very hard because of the preponderance of bad guys focused on the web as a vector for attack. If you don't have a lot of browser development experience, you're bound to get some the hard way.