Hide annoying facebook quiz notifications

With the last Facebook update, annoying quiz application notifications entered in our lives. It’s pretty annoying, not only I do not give any sh*t about a quiz someone takes, but also makes it very hard to see anything else.
Here is a solution to hide these annoying quiz notifications.

1. You have to be a Firefox or Chrome user in order to makes this thing work. If you are not, get Firefox or Chrome.
2. Install GreaseMonkey add-on to your Firefox (GreaseMetal for Chrome).
3. Click here to Install the Facebook Purity GreaseMonkey script.

Thats it!!!! No more annoying quiz/other application notifications!!!