UPDATE 2: Apparently a loophole like this happened back in 2010 and PC locked the accounts of the offenders. So proceed at your own risk!
UPDATE: Seems like you can do this over and over again infinitely… on the same browsers too. This is definitely going to be shut down soon so good luck!
The Points Guy tells us that we can instantly earn 300 free Priority Club points just by downloading their search toolbar. I just tried this in the Google Chrome browser and I was credited 300 points just by downloading the toolbar from this link. I didn’t even have to install it.
Then, I tried downloading the toolbar AGAIN from Internet Explorer. The download was successfuly and, surprisingly, I was again instantly credited 300 more points!
I decided to push my luck some more and try the same thing in Mozilla Firefox. I entered my PC number, PIN, and info and voila… 300 more points!
So I can confirm that I received 3 separate entries of 300 points instantly in my Priority Club account. Not bad for a few keystrokes and some clicks. Enjoy!