This extension does not act like a normal adblocker extension. It just detects and removes sponsored posts that Facebook inserts between your actual posts. The extension does not have a network observer hence it is much faster than a normal adblocker extension. Basically, it only observes post creation and detects the "sponsored" keyword and remove the post with this keyword. That's it!
1. There is no user interface for this extension.
2. To disable the extension go to the extension manager of your browser and press the disable button. Note that you will need to refresh Facebook pages too.