According to experts Microsoft web Browser, Internet Explorer which is most popular browser in the world, lacks security from hacking.The problem occurs because of a design bug in the system used by Windows PCs to obtain proxy settings, researchers with security firm IOActive said at the “ShmooCon” hacker conference in Washington, DC. As a result, an hacker with access to a network can insert a malicious proxy server and could monitor all the traffic, the researchers said.
Chris Paget, director of research and development at IOActive, said in an interview ”

The upshot of it is that I can become your proxy server without you knowing about it. I can put up the equivalent of a detour sign on your network and redirect all the traffic.

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Paget further said: “When IE starts up, it will ask the network where its proxy server is.”
He also told in an interview after his presentation on the problem: ”

The upshot of it is that I can become your proxy server without you knowing about it. I can put up the equivalent of a detour sign on your network and redirect all the traffic.

”
Now Microsoft acknowledges this problem and it has published in its website support article: ” If an entity can surreptitiously register a WPAD entry in DNS or in WINS... clients may be able to route their internet traffic through a malicious proxy server.”
According to a Internet research firm the Top 5 browsers are as follows:

1. Internet Explorer (Microsoft) - 84.5%
2. Firefox (Mozilla) - 11.41%
3. Safari (Mac) - 3.45%
4. Opera - 0.33%
5. Netscape - 0.21%

Via: silicon.com