Custos - Deal Tracker by Max Luong

Track product prices across online stores, get price-drop alerts, compare variants, and keep price history on your device.

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About this extension

Custos is a privacy-focused product price and deal tracker for Firefox.

Track products from online stores and let Custos keep a local price history on your device. Custos can periodically check supported product pages for price changes, target-price matches, restocks, and other updates.

Features

• Track products from online stores
• Maintain local price history
• Set target prices
• Receive price-drop notifications
• Receive restock notifications
• Track product variants when available
• Compare product pricing and changes over time
• Amazon products can be updated when you visit their product pages

Privacy

Custos does not require an account and does not use a Custos-operated backend server. Product URLs, names, prices, variants, tracking settings, target prices, and price history are stored locally in your browser.

To check prices, Custos may connect directly from your browser to product pages that you have chosen to track.

Custos does not sell your information, use advertising trackers, or transmit your browsing history to a Custos server.

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Permissions and data

Required permissions:

Display notifications to you
Access your data for sites in the amazon.com domain
Access your data for sites in the amazon.co.uk domain
Access your data for sites in the amazon.de domain
Access your data for sites in the amazon.ca domain
Access your data for sites in the amazon.fr domain
Access your data for sites in the amazon.it domain
Access your data for sites in the amazon.es domain
Access your data for sites in the amazon.in domain
Access your data for sites in the amazon.co.jp domain

Optional permissions:

Access your data for all websites

Data collection:

The developer says this extension doesn't require data collection.