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YouTube: grayscale thumbnails for focus

Strips colour from thumbnails so loud previews stop grabbing attention; colour returns on hover.

Code to copy

/* Desaturate thumbnails so loud previews stop pulling your eye */
ytd-thumbnail img,
yt-image img {
  filter: grayscale(100%) !important;
  transition: filter 0.2s ease;
}
ytd-thumbnail:hover img,
yt-image:hover img {
  filter: grayscale(0%) !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.