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But isn't Safari 4.1 still supported by Apple? The issue isn't the age of the codebase -- it's whether anyone is still bothering to patch known security issues!

From Wikipedia:

Safari 4.1.3 is the final version for Tiger as of 18 November 2010.[9] Despite not having received security updates since then, Tiger remains popular with Power Mac users...

Yikes. Surely there have been security bugs discovered since then, no? I wouldn't use that browser.

Security issues, most likely.

Plus new HTML features, but they are secondary.

Sort of. Cosmic rays, for one. And bad sectors.

But, half-joking aside, it's dangerous to run old browsers with no security updates. It might not have bitten you, and it might never bit you (like how you can run off a red light lots of times and you might not crash into anyone).

That doesn't make it less dangerous than running a browser WITH security updates.