MarketButler

**See every Cardmarket seller's matches for all your wantlists — in one click.** MarketButler is a privacy-first companion for Cardmarket. Instead of opening each of your wantlists one by one to check what a seller has, click one button on a seller's page and MarketButler fetches and merges all your wantlist-filtered matches into a single table, with a new "Wantlist" column showing which list each card came from. **What MarketButler does** - **One-click aggregation** — a "Find all wantlist matches" button appears above a seller's offer table; one click merges matches from every wantlist into one view. - **Wantlist column** — every matched card shows its source wantlist. - **Full pagination** — every page of a seller's offers is aggregated, not just page one. - **Cart-aware highlighting** — on product and card pages, sellers already in your cart are highlighted; on the cart page, a "highlight duplicates" toggle badges cards you're buying from multiple sellers so you can spot duplicates before checkout. - **Wantlist control** — the popup lets you enable/disable individual wantlists, so you only check the lists you care about. - **Remove from your wantlists** — matched rows get a red trash button, the same icon Cardmarket uses on a wantlist: in the single-wantlist and aggregated views it removes the card from that row's wantlist, on a seller's full inventory from every wantlist that wants it. - **Wantlist badges** — a small "WL" badge marks cards that are on your wantlists, on card pages, seller pages, the homepage "Best Sellers" widget and the trends pages. Hovering shows the wantlists, clicking opens one. - **Always up to date** — adding or removing cards on Cardmarket is picked up right away; no manual refresh needed. A Settings option (off by default) can limit badges to the wantlists selected in the popup. - **Hide recurring Cardmarket notices** — the Reminders tab in Settings hides the notices you don't need: the shopping-cart reminder, the unpaid-orders notice, the phishing warning, the request-success confirmation and the evaluation reminder. - **Optional MTG Reserved List badges** — marks cards on the Magic: The Gathering Reserved List with a golden "RL" badge (off by default, works offline). - **Display "Remove all items"** — the button that removes all of a seller's items from your cart stays visible on small display sizes. **Settings** Three tabs: **Wantlists** (which lists to check), **Features** (aggregation button, cart highlighting, duplicate highlighting, wantlist badges, reserved-list badges and badge scope) and **Reminders** (which Cardmarket notices to hide). **Privacy by design** MarketButler runs only on `www.cardmarket.com`. Everything it reads is processed locally in your browser and stored only in local extension storage. It makes no network requests except to Cardmarket itself, and it sends **no data** to the developer or any third party. There is no telemetry, no analytics, and no account of its own. **Supported** Chrome (MV3, desktop), Microsoft Edge (MV3, desktop), and Firefox 142+ (desktop and Android).