Price Tracker — Ozon, WB, Яндекс.Маркет, AliExpres by Александр

📍 Price Tracker is a powerful Firefox extension that helps you track prices on four major marketplaces: Ozon, Wildberries, Yandex.Market and AliExpress.

Features:
- Shows the current product price
- Displays the crossed-out original price (if discounted)
- Calculates the discount percentage automatically
- Saves price change history
- Draws a price trend chart
- Sends notifications when prices drop or rise
- Adds products to a watchlist
- Opens a search for the same product on other marketplaces in one click
- Exports price history to CSV (for Excel) and JSON
- Imports data from a file (backup)
- Configurable notifications (trigger threshold)
- Multi-currency support (₽, $, €, ¥, ₸, Br and more)

Supported marketplaces:
- Ozon
- Wildberries
- Yandex.Market
- AliExpress

Price comparison:
Open a product on one marketplace — click "🔍 Find on others" — the menu will show the remaining marketplaces. One click — and you can see where this product is cheaper.

Privacy:
The extension does NOT collect, transmit or store your personal data. All price information is stored exclusively in your browser's local storage (browser.storage.local) and is used only to display history and charts on your device.

How it works:
Open a product page on Ozon, Wildberries, Yandex.Market or AliExpress — a widget with the price will appear in the bottom right corner. Click "Track" to add the product to your watchlist. The extension will automatically save all price changes and send notifications.

Tip:
Use the "CSV" and "JSON" buttons to export history — this helps you analyze price dynamics and make the right purchasing decisions. And the "🔍 Find on others" button shows where the same product is sold cheaper.