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WhatsApp Web: hide system messages

Hides "X joined" or "Y changed subject" entries, leaving only the actual conversation in view.

Code to copy

/* Hide noisy system messages like "X joined", "Y left", "Group icon changed" */
#main [data-testid="msg-system"],
#main div[role="row"] [class*="system-message"],
#main div[role="row"]:has([data-testid="msg-system-text"]) {
  display: none !important;
}

How to use this example

1. Copy the code with the button above.
2. Install JustZix (2 minutes) and open the extension on the target page.
3. Add a new rule matching that page.
4. Paste the code into the rule's CSS panel and save — the effect appears instantly.