There's still a fairly widespread perception among Web users that IE has security problems, and we do occasionally hear about exploits that need to be plugged. But a report by the NSS Labs showed that IE8's SmartScreen filtering did the best job at thwarting socially engineered malware and phishing attacks (okay, the study was commissioned by Microsoft, but it is an independent lab). On the other hand, at the annual, pwn2own hacking contest, only Chrome wasn't penetrated, thanks to its total sandboxing. IE9 does run plugins in a sandbox, and adds ActiveX filtering for more safety.
Internet 8 started a trend of browsers running tabs in more than one process, to prevent a total browser crash if one bad site acted up. But IE8 bunched 3 or 4 tabs per process, while Chrome actually ran each tab—and each plugin—in its own process. IE9 now gets closer to this extreme: When I had 12 tabs open, there were 9 running processes, so figure two tabs per process and three for plugins.
Microsoft has done more than separate processes for tabs, though. They've added "hang recovery," for when a website script runs on forever, and crash recovery can either restore a bad-acting tab or reload a group of tabs to the last good point if the browser closes. In addition to the download manager's scanning for malware, IE's SmartScreen has been updated to block malicious content even when it's on a good page, such as an externally served malicious advertisement on a legitimate news page.
When it comes to private browsing, Internet Explorer's InPrivate mode is still the only one among popular browsers that by default hides site's activities from other third-party sites. This has been around since IE8, so I'm surprised other browser makers haven't included it (there is a Firefox add-on that allows control over third-party snooping).
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