Orion is compatible with a large number of extensions for Chrome, Firefox, and Safari.
Not all of them work, and yes, we plan to offer documentation for creating extensions that are immediately compatible with Orion.
To be clear, I didn't mean for my original comment to be a dig at Orion at all. I am just genuinely excited for it, but an extension ecosystem is something I value a lot in a browser. So I was a little bit miffled, when the original post namedropped extensions, but didn't provide any details beyond that.
However, thanks for clarifying the current state of affairs in terms of extensions, and I am eagerly looking forward to checking out the docs.