diff --git a/src/invisible_playwright/prefs.py b/src/invisible_playwright/prefs.py
index be3263a..529b01f 100644
--- a/src/invisible_playwright/prefs.py
+++ b/src/invisible_playwright/prefs.py
@@ -243,18 +243,6 @@ _BASELINE: Dict[str, Any] = {
     # improves fingerprint consistency — it cannot break connectivity.
     "security.ssl3.ecdhe_ecdsa_aes_128_sha":              False,
 
-    # Date.now property normalization. Our build's *pristine* built-in Date.now
-    # property carries an internal representation that differs subtly from a
-    # stock Firefox's, which some fingerprint scripts can distinguish from a
-    # normal property. The binary (Juggler FrameTree) performs a plain
-    # self-assignment `Date.now = Date.now` in every new main-world document,
-    # converting it to a normal data property identical to a real browser's —
-    # WITHOUT changing its value, identity or toString (it stays the native
-    # function reporting "[native code]"). Pure fingerprint-consistency, no
-    # behavior change. Requires the binary's `zoom.stealth.normalize_date_now`
-    # support (firefox builds from 2026-06-15 on).
-    "zoom.stealth.normalize_date_now":                    True,
-
     # Safebrowsing — chatty and fingerprintable.
     "browser.safebrowsing.malware.enabled":               False,
     "browser.safebrowsing.phishing.enabled":              False,