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Number the files in a PR diff

Prefixes a sequential number before each changed file name, making it easier to navigate a long pull request.

Code to copy

// Prefix each changed file header with an index number
document.querySelectorAll('.file-header .file-info a.Link--primary, .file-header .file-info .Truncate').forEach(function (el, i) {
  if (el.dataset.jzNum) return;
  el.dataset.jzNum = '1';
  el.textContent = (i + 1) + '. ' + el.textContent;
});

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 JavaScript panel and save — it runs on every page visit.