Gray Tranquillity by revoltism

Theme with a single image placed centrally and then tiled. I needed a theme based around the color #2a2a29. See <a rel="nofollow" href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/14cab085668108c93058aef02adaa5eadff4c1ece5717f908775ad8609b53ab5/https%3A//developer.mozilla.org/en-US/Add-ons/WebExtensions/Examples%23themes">https://developer.mozilla.org/en-US/Add-ons/WebExtensions/Examples#themes</a>