That simple extension shows USD to Russian RUB exchange rate on the left center part of Gnome top panel. Exchange rate updates every 30 seconds. Compatible with Gnome 45-47. This extension is using economia.awesomeapi.com.br. It is a fork of usd-try.
Note: Binary files aren't shown on the web site. To see all files, please download the extension zipfile.
USD to RUB viewer