diff --git a/ui/.build/src/build.ts b/ui/.build/src/build.ts
index 75373bf48f4a..23aeeb81ffb0 100644
--- a/ui/.build/src/build.ts
+++ b/ui/.build/src/build.ts
@@ -7,7 +7,7 @@ import { sass, stopSass } from './sass';
 import { esbuild, stopEsbuild } from './esbuild';
 import { copies, stopCopies } from './copies';
 import { startMonitor, stopMonitor } from './monitor';
-import { initManifest } from './manifest';
+import { initManifest, writeManifest } from './manifest';
 import { clean } from './clean';
 import { LichessModule, env, errorMark, colors as c } from './main';
 
@@ -50,6 +50,7 @@ export async function stop() {
 }
 
 export function postBuild() {
+  writeManifest();
   for (const mod of env.building) {
     mod.post.forEach((args: string[]) => {
       env.log(`[${c.grey(mod.name)}] exec - ${c.cyanBold(args.join(' '))}`);
diff --git a/ui/.build/src/esbuild.ts b/ui/.build/src/esbuild.ts
index b8be7a30a719..43b74b4c37d2 100644
--- a/ui/.build/src/esbuild.ts
+++ b/ui/.build/src/esbuild.ts
@@ -58,12 +58,11 @@ export async function esbuild(tsc?: Promise<void>): Promise<void> {
 const onEndPlugin = {
   name: 'onEnd',
   setup(build: es.PluginBuild) {
-    build.onEnd((result: es.BuildResult) => {
+    build.onEnd(async (result: es.BuildResult) => {
       for (const err of result.errors) esbuildMessage(err, true);
       for (const warn of result.warnings) esbuildMessage(warn);
+      if (result.errors.length === 0) await jsManifest(result.metafile!);
       env.done(result.errors.length, 'esbuild');
-      if (result.errors.length) return;
-      jsManifest(result.metafile!);
     });
   },
 };
diff --git a/ui/.build/src/manifest.ts b/ui/.build/src/manifest.ts
index 074fa5dcd289..10978532e868 100644
--- a/ui/.build/src/manifest.ts
+++ b/ui/.build/src/manifest.ts
@@ -9,12 +9,12 @@ import { allSources } from './sass';
 
 type Manifest = { [key: string]: { hash?: string; imports?: string[] } };
 
-const current: { js: Manifest; css: Manifest } = { js: {}, css: {} };
+const current: { js: Manifest; css: Manifest; dirty: boolean } = { js: {}, css: {}, dirty: false };
 let writeTimer: NodeJS.Timeout;
 
 export async function initManifest() {
   if (env.building.length === env.modules.size) return;
-  // we're building a subset of modules. if possible reuse the previously built full manifest to give us
+  // we're building a subset of modules. reuse the previousl full manifest for
   // a shot at changes viewable in the browser, otherwise punt.
   if (!fs.existsSync(env.manifestFile)) return;
   if (Object.keys(current.js).length && Object.keys(current.css).length) return;
@@ -24,15 +24,20 @@ export async function initManifest() {
   current.css = manifest.css;
 }
 
+export async function writeManifest() {
+  if (!current.dirty) return;
+  clearTimeout(writeTimer);
+  writeTimer = setTimeout(write, 500);
+}
+
 export async function css() {
   const files = await globArray(path.join(env.cssTempDir, '*.css'), { abs: true });
   const css: { name: string; hash: string }[] = await Promise.all(files.map(hashMove));
   const newCssManifest: Manifest = {};
   for (const { name, hash } of css) newCssManifest[name] = { hash };
-  if (enumerableEquivalence(newCssManifest, current.css)) return;
+  if (isEquivalent(newCssManifest, current.css)) return;
   current.css = shallowSort({ ...current.css, ...newCssManifest });
-  clearTimeout(writeTimer);
-  writeTimer = setTimeout(write, 500);
+  current.dirty = true;
 }
 
 export async function js(meta: es.Metafile) {
@@ -53,10 +58,9 @@ export async function js(meta: es.Metafile) {
     }
     newJsManifest[out.name].imports = imports;
   }
-  if (enumerableEquivalence(newJsManifest, current.js) && fs.existsSync(env.manifestFile)) return;
+  if (isEquivalent(newJsManifest, current.js) && fs.existsSync(env.manifestFile)) return;
   current.js = shallowSort({ ...current.js, ...newJsManifest });
-  clearTimeout(writeTimer);
-  writeTimer = setTimeout(write, 500);
+  current.dirty = true;
 }
 
 async function write() {
@@ -98,6 +102,7 @@ async function write() {
       JSON.stringify(serverManifest, null, env.prod ? undefined : 2),
     ),
   ]);
+  current.dirty = false;
   env.log(`Manifest hash ${c.green(hash)}`);
 }
 
@@ -142,20 +147,16 @@ function parsePath(path: string) {
   return match ? { name: match[1], hash: match[2] } : undefined;
 }
 
-function enumerableEquivalence(a: any, b: any): boolean {
+function isEquivalent(a: any, b: any): boolean {
   if (a === b) return true;
   if (typeof a !== typeof b) return false;
   if (Array.isArray(a))
-    return (
-      Array.isArray(b) &&
-      a.length === b.length &&
-      a.every(x => b.find((y: any) => enumerableEquivalence(x, y)))
-    );
+    return Array.isArray(b) && a.length === b.length && a.every(x => b.find((y: any) => isEquivalent(x, y)));
   if (typeof a !== 'object') return false;
   const [aKeys, bKeys] = [Object.keys(a), Object.keys(b)];
   if (aKeys.length !== bKeys.length) return false;
   for (const key of aKeys) {
-    if (!bKeys.includes(key) || !enumerableEquivalence(a[key], b[key])) return false;
+    if (!bKeys.includes(key) || !isEquivalent(a[key], b[key])) return false;
   }
   return true;
 }
diff --git a/ui/common/css/component/_lichess-pgn-viewer.scss b/ui/common/css/component/_lichess-pgn-viewer.scss
index 30f918240add..008be59453e1 100644
--- a/ui/common/css/component/_lichess-pgn-viewer.scss
+++ b/ui/common/css/component/_lichess-pgn-viewer.scss
@@ -10,6 +10,9 @@
   --c-lpv-bg-pane: #{$m-bg-zebra2--fade-1};
   --c-lpv-pgn-text: #{$c-bg-zebra2};
   --c-lpv-font: #{$c-font};
+  // TODO: erase or replace with `--c-lpv-past-moves` when lpv-pgn-viewer > 2.1.0 is out
+  --c-lpv-font-accent: #{$c-font};
+
   --c-lpv-font-shy: #{$c-font-dim};
   --c-lpv-accent-over: #{$c-over};
   --c-lpv-fbt-hover: #{$m-primary_bg--mix-75};