Links litteraly put your a graphical (X11) or terminal based checkbox to enable that to enforce everything through the proxy with the settings menu. Not too easy. If you are going to use Tor you shouldn't be just using Tor Browser by default neither if it enables some JS options. Firefox' base is too huge to configure so nothing ever leaks. There are too many components. A/V, WebGL, telemetry, WASM, WebRTC...