Hi, The first step is you have confirm the "Allow Firefox" to install and run studies is checked (see instructions below. How do you see the studies that you in? - To see the studies you are participating in, type about:studies into your address bar. - You'll also see studies you've participated in the past. How do you opt out? To opt out of a specific study - Type about:studies into your address bar to see a list of your studies. - Click the (Remove) button next to the study that you want to opt out of. To opt out of all studies - Click the menu button -> select Settings -> select Privacy & Security panel - Scroll down to the Firefox Data Collection -> use Section - Uncheck the mark next to Allow Firefox to install and run studies You can see also: https://support.mozilla.org/en-US/kb/shield