Whatever this thing does. https://reckless.mutinywallet.com/

But also like, do you want to do this? Its one thing to make a pwa bundled into a sandboxed application encrypted data at rest and all those other software practices, but its another thing to load something like this into google chrome where the user might have some browser extension installed that either messes the app or is malicious out the gate and steals funds

(I use as a singular example but just scroll through the CVE list. Browsers struggle to be secure)