I recently updated to macOS 15.3.1 (from 15.3.) and since then Orion freezes upon startup.
There were 110 tabs open, I often had more.
I deleted preferences according to the support document and that didn't work. I also deinstalled Orion using App Cleaner and emptied the trash and then redownloaded the Orion installer.
Upon starting the new Orion I get that "do you want to play the intro video" message and Orion freezes again.
I use an M1 Max Macbook Pro.
Orion starting like normal.
0.99 / macOS 15.3.1
Sequoia (15)