# MOC Source

> Compares LEGO Pick a Brick / Bricks and Pieces prices against BrickLink store prices, right on BrickLink.com. Includes a list manager for wanted lists/carts, and a Projects tool for planning part sourcing across LEGO and BrickLink stores.

Canonical page: [https://chrome-stats.com/d/moc-source](https://chrome-stats.com/d/moc-source)

## Overview

- **ID:** `moc-source`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** moc-source
- **Category:** shopping
- **Daily users:** 3
- **Version:** 0.4.21
- **Last updated:** 2026-09-01
- **First published:** 2026-07-14
- **Size:** 127 KB
- **Data as of:** 2026-09-11
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/moc-source/)
- **Website:** [https://api.moc-source.com/guide](https://api.moc-source.com/guide)
- **Privacy policy:** [https://addons.mozilla.org/firefox/addon/moc-source/privacy/](https://addons.mozilla.org/firefox/addon/moc-source/privacy/)

## Description

MOC Source overlays live LEGO Pick a Brick (PAB) and Bricks and Pieces (BAP) prices directly onto <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/c576f8d079de3c3efd6c26dc55a5f92318dbf16ffff25cee1e5f8cd13a5412b0/http%3A//BrickLink.com" rel="nofollow">BrickLink.com</a> — on wanted lists, store carts, store listings, and catalog pages — so you can see at a glance whether a part is cheaper from LEGO direct or from the BrickLink store you're browsing.

Click the toolbar icon to open the built-in list manager: import your BrickLink wanted lists and store carts, track Want/Have quantities, and compare LEGO-direct pricing part by part. The Projects workspace lets you split a wanted-list pool across multiple LEGO Pick-A-Brick carts and BrickLink store carts, auto-allocating each part to its cheapest source and tracking savings including shipping.

Price badges work on BrickLink's public pages with no account needed. Importing your own wanted lists/carts requires a free <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/c576f8d079de3c3efd6c26dc55a5f92318dbf16ffff25cee1e5f8cd13a5412b0/http%3A//BrickLink.com" rel="nofollow">BrickLink.com</a> account (data stays local to your browser). LEGO cart transfer requires a <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/33d49a5032337e7477f98419889428940bb0083ea57d4e7d4e09864960a88aaf/http%3A//LEGO.com" rel="nofollow">LEGO.com</a> login.

Free and open source (AGPL-3.0). Built by an AFOL, for AFOLs — not affiliated with the LEGO Group or BrickLink.

## Rankings

- #55,235 — Overall
- #56 — source
- #67 — source code
- #90 — resource

## Permissions and access

### Permissions

- `storage`
- `tabs`
- `cookies`

### Host permissions

- `https://*.bricklink.com/*`
- `https://store.bricklink.com/*`
- `https://api.moc-source.com/*`
- `https://www.lego.com/*`
- `https://www.bricklink.com/*`

### Content script matches

- `store.bricklink.com`
- `www.bricklink.com`
- `www.lego.com`

## Safety

- **Risk impact:** Moderate risk impact
- **Risk likelihood:** High risk likelihood

### Analysis details

- Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- This extension was recently updated in the past month. New updates may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/moc-source)