The most insidious hijacked Web pages are nearly impossible to spot. Tiny snippets of inserted code that don't display on the page can nevertheless launch devastating behind-the-scenes attacks. Trying to avoid such pages on your own is asking for trouble, especially since crooks like to hack popular sites. But new site-blocking features in the just-released Firefox 3 and Opera 9.5 browsers provide some shielding.

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Both browsers expand on the previous version's antiphishing features to block known mal ware sites as well, whether they're hijacked pages on legitimate sites or sites that were specifically created by bad guys. Neither browser completely eliminates the risk of landing on such pages, but the extra wprotection helps. Microsoft plans to add a similar feature to Internet Explorer 8, bu'fthis version won't be ready for prime time for a good while.