with orion set as the default browser, opening a website from the command line opens it in a preview/popup window instead of the already opened instance of the browser.
open https://apple.com
with firefox or safari as the default browser running the same command opens the website in the already opened full browser window. If one wasn't already opened it opens one that is not a popup.
I would expect orion to follow this same convention.
Version 0.99.131-beta
Sequoia (15)