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Hacker News: single-thread focus mode

Slightly dims every comment and fully brightens only the one your cursor currently hovers over.

Code to copy

/* Focus mode: fade comments until you hover over them */
.comtr {
  transition: opacity 0.15s ease-in-out !important;
}
.comtr:not(:hover) .commtext {
  opacity: 0.78 !important;
}
.comtr:hover .commtext {
  opacity: 1 !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.