InMyTwoCents CurrencyConverter av MarioShuuya

"In My Two Cents" scans every web page you visit for currency amounts, symbols like $4.50, ¥1,200, €99, or codes like USD 500, and appends the converted value right next to the original text.

Features:
- Supports 30 currencies including USD, EUR, GBP, JPY, INR, BRL, and more
- Live exchange rates from the Frankfurter API, cached for 60 minutes
- Inline conversion, no popups or copy-pasting needed
- Favorite currencies, star the ones you use most so they appear at the top of the dropdown
- Works on dynamically loaded content (infinite scroll, AJAX pages)
- Quick-glance popup showing the current exchange rate
- Advanced option to customize the currency detection regex
- No data collection, no tracking, no accounts, fully local and private

Source code: https://github.com/MarioShuuya/in-my-two-cents-currency-converter