Price Tracker: AnyTracker by Shervin Koushan

This extension turns any webpage into a QR code you can scan with your phone to open AnyTracker, pre-filled with that page's URL.

Click the toolbar icon on any product page or site you want to track. A QR code appears immediately. Scan it with your phone's camera to open AnyTracker (iOS or Android) directly on the "Add Website" page with the URL already filled in.

AnyTracker lets you track prices, stock availability, and other changes on any website, and get notified the moment something changes.

This extension only reads the URL of the tab you're currently viewing, and only when you click the toolbar icon. It never runs in the background, never collects browsing history, and never sends any data to any server. The QR code is generated entirely offline.