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Hide promotional notice banners

Hides promotional and informational banners at the top of pages while keeping important warnings and errors.

Code to copy

.flash-notice:not(.flash-error):not(.flash-warn),
[data-testid="promo-banner"], .js-notice.color-bg-accent,
.AppHeader-banner, .release-notes-banner,
.subscription-banner {
  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.