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Trello: blur card titles until hover

Blurs card titles and sharpens them only on hover, protecting against shoulder-surfing.

Code to copy

/* Blur card titles until you hover, for shoulder-surfing privacy */
[data-testid="card-name"],
.list-card-title {
  filter: blur(4px) !important;
  transition: filter 0.12s ease !important;
}
[data-testid="trello-card"]:hover [data-testid="card-name"],
.list-card:hover .list-card-title {
  filter: 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.