I have never heard of Supermium. Maybe I might try it later, but what zsolt500 wrote about MyPal is NOT TRUE unless zsolt500 meant old Mypal 29.x, based on Pale Moon, which is more than two years old now and has been since abandoned in favor of Mypal68. I doubt if there is anyone who uses old Mypal now. Mypal68 is based on Quantum Firefox and is super fast.
I believe currently much of its code is largely based on Firefox 8x.x or 9x.x. Feodor2, the developer, might update it to be comparable to Firefox 100 or later as I showed Firefox 102 runs very fast even on Windows XP computers when Windows 7 or 10 is installed on them instead.
In any way I have no trouble accessing my ebay account or my bank account using Mypal68. I have been able to access all the websites with the latest Mypal 68.14.4b. I am not saying it is a perfect browser, but at least it is not anything like zsolt500 wrote about it.
zsolt500 should really take it back.
All the same, a new XP-compatible browser is always welcome. If it turns out to be as good as zsolt500 says, I might even distribute it at one of my Japanese-language websites just like I do distribute Mypal 68 and Serpent.
Sadly, though, Supermium lacks basic documentation. We want to know what the developer intends to do with it and what we need to run it. What I know about it is only its name. I hope it is not a virus or something that sends the user's personal information to Google. Really. That matters a lot.