Bookmark Dedup

A Chrome extension (Manifest V3, plain JS, no build step) that finds bookmarks pointing at the same URL, shows them grouped side by side, and lets you choose which ones to delete.

Install (unpacked)

1. Open chrome://extensions.
2. Turn on Developer mode (top right).
3. Click Load unpacked and select this folder. You can also download bookmark-dedup-<version>.zip from Releases, extract it, and select the extracted folder.
4. Pin the extension and click its icon. The dashboard opens in a new tab.

After editing files, click the reload ↻ button on the extension card and refresh the dashboard tab.

Using it

• Each card is one group of duplicates. Every row shows the title, the full URL, the folder it's in and the date it was added.
• Keep (radio) marks the bookmark you want to keep. It defaults to the oldest one. Delete N others removes every other bookmark in that group.
• Delete on a row removes just that bookmark.
• Every delete can be undone from the toast or with Ctrl+Z, as long as the dashboard tab stays open. Restored bookmarks go back into their original folder and position, but they get a new id and "date added".
• Click the 📁 folder path to open that folder in the bookmark manager.
• The list updates live when bookmarks change anywhere in Chrome.

Matching modes

Mode	Treated as duplicates
Normalized (default)	Ignores http vs https, a leading www., host case, default ports (:80/:443), the #fragment and trailing slashes. The query string does count. Non-http(s) URLs are compared exactly.
Exact	Only URLs that are identical character for character.

Permissions

• bookmarks: read and delete bookmarks.
• favicon: show site icons from Chrome's favicon cache.

There are no host permissions, so nothing leaves your browser.

Project layout

manifest.json       extension manifest (MV3)
background.js       toolbar click → opens dashboard.html
dashboard.html/css/js  the UI
lib/normalize.js    pure logic: URL normalization, tree flattening, grouping
tests/              node:test unit tests for lib/
icons/              toolbar / store icons

Tests

npm test

This needs only Node 18+ and has no dependencies.

Releasing

1. Bump version in manifest.json (and package.json), then commit and push.
2. Tag and push: git tag -a vX.Y.Z -m vX.Y.Z && git push origin vX.Y.Z

The Release workflow runs the tests, checks that the tag matches manifest.json, builds a zip of the extension files only, and publishes the GitHub release. 0.x versions are published as pre-releases.