Malware reports are showing up again, so it's time for safety reminders. We aren't immune to malware, but I've yet to see a nasty that could install itself without user permission. Don't automatically give permission to every dialog box that pops up. Look at it. Read it. Are you trying to install something? Modify something? No? Then don't give it your password. I grumble every time the iTunes Store or the App Store asks for my password, but it's for my safety, so I don't grumble much.
Safari is my browser of choice, and there are a couple of things you should do with it to help protect your computer. The default Downloads folder in your home directory is nice, but I have all files downloaded to my desktop. I want to see what's downloading. Change it in Safari Preferences under the General tab. You can always move files when you are done with them. And while you are there, make sure that you don't have "Open "safe" files" checked. Open them when you are finished browsing.
Using Firefox instead? Yep, there are similar settings under Firefox Preferences. Check the Security Tab, You want these items checked.
Set your downloads location under the Firefox Preferences General tab. You can also have it open the Downloads window when downloading a file. Do it just in case something is downloading instead of opening in the browser. Safari does this automatically. It's just a little thing, but at least you'll be warned if something is downloaded to your computer.
Whatever browser you use, check the preference settings. The right settings can give you just a bit more security. And please, don't automatically click okay or type your password without thinking about it. Stay safe.