Chrome Extension

Install the SellerMagnet Chrome Extension to analyze Amazon products directly on any product page, profitability, fees, BSR (Best Seller Rank), and competition data without leaving your browser.

Difficulty: 🟡 Intermediate · Reading time: ~7 min

📋 Overview

The SellerMagnet Chrome Extension brings the full power of the Product Sourcer directly into your browser. When you visit any Amazon product page, the extension overlays key metrics, profitability, fees, BSR, estimated sales, and competitive data, so you can evaluate products without switching tabs or copying ASINs.

This is essential for online-arbitrage sellers, retail-arbitrage researchers, and anyone who browses Amazon as part of their sourcing workflow.

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Installation

Chrome Extension - Amazon product sourcing overlay

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Step 1: Download from Chrome Web Store

1. Open Google Chrome.

2. Navigate to the SellerMagnet Chrome Extension page on the Chrome Web Store.

3. Click Add to Chrome.

4. Confirm the permission dialog by clicking Add Extension.

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Step 2: Pin the Extension

1. Click the puzzle-piece icon in Chrome's toolbar (Extensions menu).

2. Find SellerMagnet in the list.

3. Click the pin icon to keep it visible in your toolbar.

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Step 3: Log In

1. Click the SellerMagnet icon in your toolbar.

2. Enter your SellerMagnet account credentials.

3. The extension connects to your account and syncs your marketplace settings.

Pro tip: If you use multiple Chrome profiles (personal, work), install the extension in the profile you use for sourcing so your login session persists.

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How It Works

Once installed and logged in, the extension activates automatically on Amazon product pages.

On-Page Overlay

When you visit any Amazon product page, the extension injects a data panel that shows:

Data Point	Description
BSR	Best Sellers Rank with category name
Est. Monthly Sales	Estimated units sold per month
BuyBox Price	Current Buy Box price
FBA Fees	Estimated Amazon fulfillment fees
Referral Fee	Category-specific referral fee percentage and amount
Net Profit	Estimated profit based on your configured cost inputs
ROI	Return on investment percentage
Margin	Profit margin percentage
Seller Count	Number of active FBA and FBM sellers
Eligibility	Whether your account is approved to sell this ASIN (Amazon Standard Identification Number)

Quick Calculator

The extension includes a built-in calculator where you can adjust:

• Cost price: your per-unit acquisition cost

• Fulfillment type: FBA or FBM

• VAT rate: for accurate net-profit calculation

As you change values, the profit, ROI, and margin update in real time.

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Supported Marketplaces

The extension works on all Amazon domains:

Region	Domains
North America	amazon.com, amazon.ca, amazon.com.mx
Europe	amazon.co.uk, amazon.de, amazon.fr, amazon.it, amazon.es, amazon.nl, amazon.pl, amazon.se
Asia-Pacific	amazon.co.jp, amazon.com.au, amazon.sg, amazon.in
Middle East	amazon.ae, amazon.sa

The extension automatically detects which marketplace you are browsing and fetches data accordingly.

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Using the Extension for Sourcing

Workflow: Online Arbitrage

1. Browse a retail website (e.g., a clearance sale page).

2. Find a product of interest.

3. Open the same product on Amazon (search by name or scan the barcode with a mobile app).

4. The extension overlay appears immediately with profitability data.

5. If the ROI meets your criteria, add the product to your sourcing list.

6. Move to the next product: no tab switching needed.

Workflow: Competitor Analysis

1. Navigate to a competitor's Amazon Storefront.

2. Browse their product catalog.

3. Click into any listing: the extension shows whether you could profitably compete.

4. Check seller count and BuyBox share to assess competitive intensity.

Workflow: Wholesale List Validation

1. Open your wholesale supplier's catalog (often as a spreadsheet).

2. For each product, search the ASIN on Amazon.

3. The extension provides instant go/no-go data on each listing.

4. Mark qualifying products and export your filtered list.

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⚙️ Extension Settings

Click the SellerMagnet icon in your toolbar to access settings:

Setting	Description
Default marketplace	Pre-select your primary marketplace for cost calculations
Default VAT rate	Set once; applies to all calculations until changed
Auto-open panel	Choose whether the panel opens automatically or on click
Theme	Match the extension panel to your preferred light/dark mode

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⚠️ Common Mistakes to Avoid

Mistake	Why It Hurts
Not logging into the extension after install	The panel shows "Login required" instead of data
Forgetting to set your VAT rate	Profit calculations are inflated because VAT is not deducted
Using the extension on non-Amazon sites	The extension only activates on amazon.* domains
Ignoring seller count data	A great ROI means nothing if 30 sellers are already competing
Not updating the extension	Older versions may miss fee structure changes from Amazon

## ✅ Best Practices

1. Set your default VAT rate immediately after installation: This ensures every profitability calculation is accurate from day one.

2. Use keyboard shortcuts: The extension supports quick-toggle shortcuts. Check the settings panel for available bindings.

3. Combine with the dashboard Sourcer: For deeper analysis (BSR history charts, BuyBox share trends, full offers table), click the "Open in SellerMagnet" link in the extension panel to jump directly to the full Sourcer dashboard.

4. Keep the extension updated: Enable Chrome's auto-update feature so you always have the latest fee tables and data algorithms.

5. Review the eligibility flag: Before sourcing a product, always confirm the green eligibility checkmark. Gated categories require Amazon approval that can take days or weeks.

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🔧 Troubleshooting

Issue	Solution
Extension panel does not appear	Ensure you are on an Amazon product page (URL contains /dp/). Try refreshing the page.
"Login required" message	Click the extension icon and log in with your SellerMagnet credentials.
Data appears outdated	Click the refresh button on the extension panel to fetch fresh data.
Extension conflicts with other extensions	Disable other Amazon-related extensions temporarily to test.
Slow loading	Check your internet connection. The extension makes API calls to SellerMagnet servers.

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❓ FAQ

Is the Chrome Extension included in all subscription plans?

Yes. The Chrome Extension is available to all SellerMagnet subscribers. The data depth and lookup limits vary by plan.

Does the extension work in Firefox or Edge?

The extension is currently available for Google Chrome. Chromium-based browsers like Microsoft Edge and Brave may also work by installing from the Chrome Web Store, but official support is for Chrome only.

Does using the extension consume my Sourcer search quota?

Each product page you visit where the extension loads data counts as one lookup against your plan's extension quota, which is separate from dashboard Sourcer searches.

Can I use the extension without a SellerMagnet account?

No. The extension requires an active SellerMagnet subscription to access product data and fee calculations.

Will the extension slow down my browsing?

The extension loads data asynchronously after the Amazon page renders. There is no noticeable impact on page load speed.

Does the extension collect my browsing data?

No. The extension only activates on Amazon domains and only sends the ASIN of the product you are viewing to SellerMagnet's servers. No other browsing activity is tracked or transmitted.

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➡️ What's Next?

Product SourcerIdentifier Converter