Find the best price for every subscription.

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What is Subscription Wizard?

Subscription Wizard is a Firefox extension that compares Amazon Subscribe & Save pricing across your personal and business accounts. Scan both sides, see every product side by side, and migrate subscriptions to whichever account has the better price — all from a toolbar that appears on your Subscribe & Save page.

Everything runs in your browser. No data leaves your machine, no external servers are contacted, and no account is required.

Features

• Scan Prices — Fetches real-time S&S and one-time pricing for every subscription on the page, including products from your other account
• Side-by-Side Comparison — Personal vs. business prices in a single table with the winner highlighted and annual savings calculated
• Bulk Subscribe — Select the subscriptions you want and subscribe on the cheaper account in one click, with the full checkout flow handled automatically
• Subscribe Navigator — Step through the other account's subscriptions one at a time: subscribe to the ones you want, skip the rest, go back to reconsider
• CSV Export — Two exports: the toolbar button exports your current account's subscription list with previous prices and price changes between scans; the comparison view exports a side-by-side report with annual cost breakdowns for both S&S and one-time pricing
• Smart Workflow — Buttons stay disabled until their prerequisites are met and coverage warnings tell you when data is incomplete
• Privacy First — All data stays in your browser's local extension storage

How it works

Three scans to lower prices:

1. Scan personal — Go to your Subscribe & Save page on your personal account and click Scan Prices
2. Switch and scan business — Switch to your business account and scan again. The extension merges your personal products in so it gets business prices for everything
3. Switch back and re-scan personal — Return to your personal account and scan one more time. This picks up prices for any business-only subscriptions, giving you complete coverage
4. Compare and migrate — Click Compare to see every product side by side. Use Bulk Subscribe to move subscriptions in bulk, or Subscribe Navigator to move them selectively one at a time

Only have subscriptions on one account? You only need two scans — scan your subscriptions, switch accounts, scan again, and you're ready to compare.

Scans take roughly 3 seconds per subscription to avoid Amazon rate limits. A typical account with 40 items takes about 2 minutes.

Screenshots

Installation

From Firefox Add-ons (AMO)

Install directly from the Firefox Add-ons listing. Updates are delivered automatically by Firefox.

From source

1. Clone this repository
2. Open about:debugging in Firefox
3. Click This Firefox → Load Temporary Add-on
4. Select manifest.json from the cloned folder

Temporary add-ons are removed when Firefox closes. For persistent local installation, use the AMO listing.

Project layout

manifest.json     Extension manifest (Manifest V2, Firefox 142+)
content.js        All extension logic — scanning, comparison, subscribe, navigator, export
content.css       Toolbar, overlay, and navigator panel styles
options.html      Extension settings page
options.js        Settings page logic (view/clear saved scan data)
icons/            Extension icons (48px, 128px, and source logo)
screenshots/      AMO listing screenshots
landing.html      Landing page for AMO and GitHub

Privacy

• All scan data is stored in Firefox's local extension storage
• No external servers are contacted
• No tracking, analytics, or telemetry of any kind
• No accounts or sign-ups required
• Your subscription data never leaves your browser

Updates

When a new version is published to AMO, Firefox delivers the update automatically. To publish an update:

1. Bump version in manifest.json
2. Rebuild the extension ZIP
3. Upload to the AMO Developer Hub

License

Subscription Wizard is available under the MIT License.