:fox_face: A firefox config that has rounded tabs and a url bar that can disappear when not selected on. It works with any theme.
You have to create the "ui.prefersReducedMotion" config in about:config and give it a value of 1 to prevent some stuttering in the animation.
You have to set "browser.urlbar.openViewOnFocus", and "browser.urlbar.update1" to false in about:config to fix a bug regarding a big white urlbar.