diff --git a/4.2.4-Header-Editor.md b/4.2.4-Header-Editor.md
index 51f285c..c107718 100644
--- a/4.2.4-Header-Editor.md
+++ b/4.2.4-Header-Editor.md
@@ -5,12 +5,13 @@ Header Editor is an extension that allows you to modify the request header and r
 :exclamation: pay attention, header names are case sensitive
 
 :small_orange_diamond: remove all ETag's
- * Note: if you disable disk *and* memory cache, this is not required
+ * ⭐ This is pointless if sites are already isolated: e.g. you use
+   - FF85+, which uses [network partitioning](https://blog.mozilla.org/security/2021/01/26/supercookie-protections/)
+   - First Party Isolation (FPI)
+   - Temporary Containers in a hardened mode
+ * Note: No browser is designed to hide repeat visits within a session, not even Tor Browser (that's what New Identity is for)
+   - You would need to sanitize fully in session, and that still leaves your IP address, among other vectors
  * Test: https://httpbin.org/
- * Test: https://privacycheck.sec.lrz.de/passive/fp_etag/fp_etag.php
- * Test: https://lucb1e.com/rp/cookielesscookies/
-   * number of visits should never be more than 2
-   * note: the site uses IP and UA to create your unique ID, so to test, do not change these
 
 ```
         Name: remove all ETag's