PriceShift Currency Converter

About

PriceShift is a high-performance, privacy-focused Chrome extension that provides elegant inline currency conversions. Unlike other converters that disrupt a website's layout, PriceShift intelligently appends converted values next to original prices, maintaining the design integrity of the page.

Features

- Per-Tab Persistence: Enable conversion on a per-tab basis. Your settings stay active even after refreshing the page, but won't interfere with your other open tabs.
- Smart Dynamic Scanning: Powered by `MutationObserver`, it automatically detects and converts prices loaded via infinite scroll (e.g., Amazon, eBay, or Twitter).
- 24-Hour Smart Caching: Minimizes API calls to the Frankfurter backend by storing rates in `chrome.storage.local`. This ensures near-instant conversion for the user and prevents API rate-limiting.
- CSP Compliant: Uses modern CSS injection instead of inline styles, ensuring the extension works on high-security websites (like banking or major e-commerce platforms).

Technical Overview

Architecture
PriceShift utilizes a Manifest V3 architecture to maximize performance and security:

1. Background Service Worker: Manages the badge count and handles persistence logic, ensuring that if you enable conversion on a site and refresh, the state is remembered.
2. Content Scripts: Uses a non-destructive `TreeWalker` to find text nodes. It creates a document fragment that wraps the original price and the converted price, allowing for a "clean" toggle-off experience.
3. Storage API: `chrome.storage.sync`: Saves your "From" and "To" currency preferences. `chrome.storage.local`: Stores the currency exchange rate cache with timestamps.