How to Remove the Pocket Button from Firefox Quantum

Firefox Quantum has deep integration with the Pocket read-it-later service, which is now owned by Mozilla. You’ll see a Pocket page action in the address bar, a “View Pocket List” feature in the Library, and recommended articles from Pocket on the new tab page. Firefox offers a way to disable this Pocket integration, but it’s hidden.
by Chris Hoffman via How-To Geek