This is developed independently by a Semux user. If you need help, or more information, ask witoldsz on discord, he is the person who created it.
online wallet are always very risky of being hacking so better to use offline local official wallet , i don't trust online wallet even created by the developer of the project .
Be safe . Thanks
it's not an online wallet! wallet it's stored in your pc.. it' more like a electrum wallet for btc
you can easy dowload the code a put on a local server on your pc.