Link to Chrome/Firefox DevTools directly.

index.html

@@ -68,7 +68,8 @@
 
 					<h2>Resources</h2>
 					<ul>
-						<li><a href="https://discourse.threejs.org/t/three-js-developer-tools/8477" target="_blank" rel="noopener">Three.js DevTools</a></li>
+						<li><a href="https://chrome.google.com/webstore/detail/threejs-developer-tools/ebpnegggocnnhleeicgljbedjkganaek" target="_blank" rel="noopener">Chrome DevTools</a></li>
+						<li><a href="https://addons.mozilla.org/en-US/firefox/addon/three-js-developer-tools/" target="_blank" rel="noopener">Firefox DevTools</a></li>
 						<li><a href="https://threejsfundamentals.org/" target="_blank" rel="noopener">Three.js Fundamentals</a></li>
 					</ul>