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Facebook: focus mode on the feed column

Hides the left and right side rails, leaving just the centered main feed column.

Code to copy

/* Focus mode: keep only the main feed column, hide both side rails */
[role="navigation"][aria-label],
[role="complementary"] {
  display: none !important;
}
[role="main"] {
  margin: 0 auto !important;
  max-width: 700px !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.