> Are you absolutely sure you would catch any malicious payload in some obscure single-purpose Python script? Of course not. But I can at least fairly easily r

> Are you absolutely sure you would catch any malicious payload in some obscure single-purpose Python script? Of course not. But I can at least fairly easily review it. And that is the point. A review cannot be done as easily with a minified JavaScript webpage or a WebAssembly binary that the WebUSB loader tool would use. Also, with regards to binary Windows blobs that would require installing Windows drivers - yes, I agree that it is considerably worse than WebUSB. But we can always find something worse.. The point I am trying to make is that WebUSB, although being better than Windows binary blobs, is still less transparent, in my opinion, than e.g. a simple Python script. Edit: To clarify: Whether the user will actually be able to find potential issues during the said review is a separate topic. But I think that the goal should be to enable users to do so. And make it as simple as possible and user-friendly as possible.