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Reddit: collapse or expand all threads

Collapses every top-level comment thread with one click, or expands them all again.

Code to copy

// Collapse every top-level comment, or expand them all again
const comments = document.querySelectorAll('shreddit-comment[depth="0"]');
const anyOpen = Array.prototype.some.call(comments, function (c) {
  return c.getAttribute('collapsed') === null;
});
comments.forEach(function (c) {
  if (anyOpen) { c.setAttribute('collapsed', ''); }
  else { c.removeAttribute('collapsed'); }
});

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. Enable the action panel, add a button in the Actions tab and paste the code into it — run it with one click.