Which is the best browser for security purpose

While LYNX continues to be pretty darn secure, it may be too secure for some folk.
Bob

You won't like Bob's suggestion of Lynx

It's a "Text Only" browser, no graphics or any other enhancements; http://lynx.browser.org/

That is about as secure as you can get.

I'm guessing that Lynx would go too far. But the question is wide ranging and there is no other simple answer.

It's not so much the browser that needs to be secure, but the person using it as it is the user who is the first and most important line of defense. For example if you visit a web site that had advertising and you click on any of the adverts, how do you know where you are going to go then? Or if a web site uses Javascript to enhance the display and content, (most professional web sites do nowadays), how can you tell that the scripts are safe?

The only sure way is to visit known and trusted web sites and leave the others alone.

That said, there are utilities that can help minimise the risk. A firewall, always on and an anti-virus, always on and used to scan 'every file' that you download prior to using.

In addition many browsers use 'Add-ons' to help the user. For example I use Firefox with the 3 add-ons AdBlockPlus, NoScript and WOT, (Web of Trust). In order they block ads, block scripts until I decide to allow them, and warn me if a site is suspect or not. But those add-ons are not available to all browsers, and different browsers may have different add-ons available.

Mark

Google chrome is pretty security safe. You can also change the security settings for your own convenience.

I also agree with the majority of the answer posted by MarkFlax - 10/26/11 4:23
In my opinion, Mozilla Firefox is the best, easiest and safest, with Extensions of your choice.

AdBlockPlus: I added it recently and like it.
NoScript: I have not tried that extension.
WOT (Web of Trust): I personally found it annoying so I removed it.

Chrome uses "sandboxing" for each browser tab, which helps isolate what's going on in the browser from the operating system underneath. IE9 runs plug-in's in a sandbox, and has added other features for privacy and security. I think that Chrome is better, security-wise than IE9, but those are the two browsers that I think offer the best combination of general browsing security and utility. I do like the auto-updating feature of Chrome, which allows Google to deliver security and bug fixes nearly transparently to me. And the extensions that I use very seldom have a problem with updates, so updates just happen and the browser becomes more secure without my having to stop using my computer to admin it.