I've been using the Secrets app for a long time now and the extensions don't work with Orion.
I tried both Chrome and Firefox versions.
Secrets.app is a password manager, built specifically for macOS, iOS and iPad OS, although it does offer extensions for non-Apple devices (Edge, Chrome, Firefox) so you can use it on Windows or Linux. I tried the Firefox extension on a proper installation of Firefox and it does work perfectly well on macOS.
https://secrets.app/support/autofilling-items/#browser-extensions
Version 0.99.126.4.1-beta (WebKit 618.1.2)
Sonoma (14)