If you are not sure what "Phishing" is, it is just what it sounds like but with a Ph instead of an F. These sly hackers set their bait and then wait. When someone bites, they get the info they want. I guess we could call these hackers anglers or maybe fanglers as they are anglers with fangs!
There is a new kind of "phishing" expedition out there now that everyone should be aware of, it is called tabnabbing. This new MOD involves users who have multiple browser tabs open at one time. While the user has let one tab go dormant the hacker substitutes the target with a page of their own that looks just like a log-in page for maybe Yahoo or Gmail. When the user goes back to that tab they think they have "timed out" so they go ahead and log back in. Now the hacker has a user ID and a password. They can search your mail for private information, they can try your user ID and password on other locations you might frequent like credit card sites (hackers know people like to use the same IDs and passwords because they don't have to remember so much), or they can launch other operations from your mail account using your contacts. The sky is the limit once they have crack one of your accounts.
At present it appears that Firefox Beta edition is shielded from these attacks. If you have Firefox, be sure to update it before you rely upon it to protect you.
If you don't want to use Firefox, always close tabs when you are done. And never log back into a site that you have timed out of without first closing your browser and reopening. Also, be sure you log out of sensitive sites when you are finished. One of my banks allowed me to navigate away then use the back arrow to get back into my page. That should not be allow so I always, always, always logout of pages when I am done with them especially bank and credit card pages.
Here is a link for more information on this new kind of phishing expedition: http://www.azarask.in/blog/post/a-new-type-of-phishing-attack/