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Slack: quiet down animated GIFs

Collapses animated GIFs and Giphy images into a narrow dimmed strip so they stop pulling your attention.

Code to copy

/* Collapse animated GIF and Giphy attachments to a quiet line */
.c-message_attachment:has(img[src*="giphy"]),
.p-file_image:has(img[src*=".gif"]) {
  max-height: 24px !important;
  overflow: hidden !important;
  opacity: 0.5 !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.