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diff --git a/browsers/README.md b/browsers/README.md
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+++ b/browsers/README.md
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+# Browser Accent Color Experiments
+
+This directory contains experiments for applying the dynamic accent color
+provided by `core/accent.h` to web browsers.
+
+## Ungoogled-Chromium
+
+Ungoogled Chromium exposes limited theming hooks and does not support
+changing its UI colors at runtime. Applying a dynamic accent color would
+require maintaining a custom patch set or an extension that continually
+re-themes the browser, which is outside the scope of this repository.
+
+## Firefox
+
+Firefox can be themed programmatically. The files here demonstrate two
+approaches:
+
+1. `firefox/update-userchrome.sh` writes a minimal `userChrome.css` using the
+   current accent color. Run it whenever the accent color changes.
+2. `firefox/extension/` contains a small WebExtension and native messaging host
+   that continuously updates a `--accent-color` CSS variable across all pages.
+
+To use the extension:
+
+1. Build the helper program:
+
+   ```sh
+   ./build.sh
+   ```
+
+2. Register the native messaging host:
+
+   ```sh
+   firefox/install-native-host.sh
+   ```
+
+3. Load `firefox/extension` as a temporary extension from `about:debugging`.
+
+These scripts are meant as a starting point for proper browser ricing and can
+be adapted to other workflows.
diff --git a/browsers/build.sh b/browsers/build.sh
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+++ b/browsers/build.sh
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+#!/bin/sh
+set -eu
+cd "$(dirname "$0")"
+cc -Wall -Wextra -std=c99 getaccent.c -o getaccent
diff --git a/browsers/firefox/accent_host.py b/browsers/firefox/accent_host.py
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+++ b/browsers/firefox/accent_host.py
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+#!/usr/bin/env python3
+import json
+import os
+import struct
+import subprocess
+import sys
+
+def send(msg):
+    data = json.dumps(msg).encode('utf-8')
+    sys.stdout.buffer.write(struct.pack('I', len(data)))
+    sys.stdout.buffer.write(data)
+    sys.stdout.buffer.flush()
+
+def read():
+    raw = sys.stdin.buffer.read(4)
+    if len(raw) == 0:
+        return None
+    length = struct.unpack('I', raw)[0]
+    return json.loads(sys.stdin.buffer.read(length).decode('utf-8'))
+
+def get_accent():
+    try:
+        helper = os.path.join(os.path.dirname(__file__), '..', 'getaccent')
+        color = subprocess.check_output([helper], stderr=subprocess.DEVNULL).decode().strip()
+        if color:
+            return color
+    except Exception:
+        pass
+    return '#000000'
+
+while True:
+    msg = read()
+    if msg is None:
+        break
+    if msg.get('query') == 'color':
+        send({'color': get_accent()})
diff --git a/browsers/firefox/extension/background.js b/browsers/firefox/extension/background.js
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+++ b/browsers/firefox/extension/background.js
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+let port = browser.runtime.connectNative("accent_color");
+let current = null;
+
+function broadcast(color) {
+  browser.tabs.query({}).then(tabs => {
+    for (let tab of tabs) {
+      browser.tabs.sendMessage(tab.id, {color}).catch(() => {});
+    }
+  });
+  browser.theme.update({colors: {toolbar: color}});
+}
+
+port.onMessage.addListener(msg => {
+  if (msg.color && msg.color !== current) {
+    current = msg.color;
+    broadcast(current);
+  }
+});
+
+function poll() {
+  try {
+    port.postMessage({query: "color"});
+  } catch (e) {
+    // ignore
+  }
+}
+setInterval(poll, 1000);
+poll();
+
+browser.runtime.onMessage.addListener((msg, sender) => {
+  if (msg.request === "color") {
+    return Promise.resolve({color: current});
+  }
+});
diff --git a/browsers/firefox/extension/content.js b/browsers/firefox/extension/content.js
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+++ b/browsers/firefox/extension/content.js
@@ -0,0 +1,15 @@
+function apply(color) {
+  document.documentElement.style.setProperty("--accent-color", color);
+}
+
+browser.runtime.onMessage.addListener(msg => {
+  if (msg.color) {
+    apply(msg.color);
+  }
+});
+
+browser.runtime.sendMessage({request: "color"}).then(msg => {
+  if (msg && msg.color) {
+    apply(msg.color);
+  }
+});
diff --git a/browsers/firefox/extension/manifest.json b/browsers/firefox/extension/manifest.json
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+++ b/browsers/firefox/extension/manifest.json
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+{
+  "manifest_version": 2,
+  "name": "Accent Color Updater",
+  "version": "0.1",
+  "description": "Updates CSS variable --accent-color using a native host",
+  "applications": {
+    "gecko": {
+      "id": "accent-color@example.com"
+    }
+  },
+  "background": {
+    "scripts": ["background.js"]
+  },
+  "permissions": ["nativeMessaging", "tabs", "<all_urls>"],
+  "content_scripts": [
+    {
+      "matches": ["<all_urls>"],
+      "js": ["content.js"],
+      "run_at": "document_start"
+    }
+  ]
+}
diff --git a/browsers/firefox/install-native-host.sh b/browsers/firefox/install-native-host.sh
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+++ b/browsers/firefox/install-native-host.sh
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+#!/bin/sh
+set -eu
+cd "$(dirname "$0")"
+HOST_DIR="${HOME}/.mozilla/native-messaging-hosts"
+mkdir -p "$HOST_DIR"
+cat >"$HOST_DIR/accent_color.json" <<JSON
+{
+  "name": "accent_color",
+  "description": "Accent color provider",
+  "path": "$(pwd)/accent_host.py",
+  "type": "stdio",
+  "allowed_extensions": ["accent-color@example.com"]
+}
+JSON
+chmod +x accent_host.py
diff --git a/browsers/firefox/update-userchrome.sh b/browsers/firefox/update-userchrome.sh
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index 0000000..dae5d97
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+++ b/browsers/firefox/update-userchrome.sh
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+#!/bin/sh
+set -eu
+ACCENT="$(../getaccent 2>/dev/null || echo)"
+[ -n "$ACCENT" ] || ACCENT="#000000"
+PROFILE_DIR="${HOME}/.mozilla/firefox"
+PROFILE="$(ls "$PROFILE_DIR" | grep default | head -n1 || true)"
+[ -n "$PROFILE" ] || { echo "No Firefox profile found" >&2; exit 1; }
+PROFILE="$PROFILE_DIR/$PROFILE"
+mkdir -p "$PROFILE/chrome"
+sed "s/ACCENT/$ACCENT/" userChrome.template.css > "$PROFILE/chrome/userChrome.css"
diff --git a/browsers/firefox/userChrome.template.css b/browsers/firefox/userChrome.template.css
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+++ b/browsers/firefox/userChrome.template.css
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+:root{
+  --accent-color: ACCENT;
+}
+
+#navigator-toolbox {
+  background-color: var(--accent-color) !important;
+}
diff --git a/browsers/getaccent.c b/browsers/getaccent.c
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+++ b/browsers/getaccent.c
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+#include <stdio.h>
+#include <unistd.h>
+#include "../core/accent.h"
+
+int main(void) {
+    ColorShm *blk = NULL;
+    char col[8];
+    if (readaccent(&blk, col)) {
+        printf("%s\n", col);
+        return 0;
+    }
+    return 1;
+}