(Recursively) Lists the count of bookmarks for each folder on your bookmarks bar. Supports all Chromium-based browsers.

count-bookmarks-bar.js

// README: Run this by copying the code and pasting it in DevTools

function countBookmarksRecursively(node) {
  let count = 0;
  if (node.children) {
    for (const child of node.children) {
      count += countBookmarksRecursively(child);
    }
  } else if (node.url) {
    count += 1;
  }
  return count;
}

chrome.bookmarks.getTree((rootNodes) => {
  const root = rootNodes[0];

  if (!root.children) {
    console.log("No bookmarks found.");
    return;
  }

  for (const topLevel of root.children) {
    if (!topLevel.title || !topLevel.children) continue;
    if (topLevel.title != "Bookmarks") continue;
    
    for (const subfolder of topLevel.children) {
      if (subfolder.children) {
        const count = countBookmarksRecursively(subfolder);
        console.log(`"${subfolder.title}": ${count}`);
      }
    }
  }
});