A currency tools.
[+] Added currency MAD (Moroccan Dirham)
[+] Added openexchangerates.org, currencylayer.com
[+] Added an option of auto refreshing
[-] Removed freecurrencyconverterapi.com because it's invalid now
Because I'm using free plan of openexchangerates.org and currencylayer.com, and the data updates hourly, so the add-on also updates every hour.
A currency tools supporting 98 currencies. Max 9 targets could be counverted to in one time. Source data includes openexchangerates.org, currencylayer.com and google.com.
Web version is here: