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Chromium. Is that Google Chrome, or a different browser? (Sorry if this is a silly question.) Does it just download the file, or does it actually open it in a new window?

It's the open source framework, if I understand it right. I use Brave which is structured on that. Built-in ad-blocker and anti-tracking. They're deploying their own crypto later this year, too.

Anyways

MyEtherWallet for me works fine in there. Sitting on some of Brave's BAT in there right now.