Mozilla is making your browsing experience safer and more private by testing a service that keeps DNS providers from collecting and sharing your browsing history. To learn more about this study, see this Mozilla blog post.

You can opt out of this study any time by following these steps:

From the Studies page

1. Type in about:studies into the Firefox address bar to see a list of studies.
2. Click the Disable button next to DNS Over HTTPS.

From the Add-ons page

1. Click the menu button , click Add-ons and themesExtensions and themes and select Extensions.
2. Click the Disable or Remove button next to DNS Over HTTPS.