Firefox was developed by Mozilla, while Microsoft develops internet Explorer. According to research, Internet Explorer is more susceptible to security threats from viruses and spyware. Firefox has been praised for its security. With Internet Explorer, you need to procure a powerful anti-virus software program to obtain some amount of security. Firefox, on the other hand, was developed by the same company who created Netscape web browsers. Firefox comes equipped with impeccable privacy settings and pop up blockers. It also can make smart keywords that work with the user’s favorite sites. Internet Explorer is not an open web browser, while Firefox is.