STEP 1
Open a new tab and go to the about:addons page by copying and pasting the text into your URL bar and pressing enter.
STEP 2
If you don't see the extension, please make sure you're on the Extensions tab on the left hand side of the screen.
STEP 3
Click the Allow option for the Run in Private Windows permission. This is required to prevent an easy way around the block. No data collected is ever sent off your computer.