I am basically in the same boat as the OP. I love the idea of Orion, but the crashes made it more and more unusable. A browser is one of the core functionalities I need. Annoyed, I finally cancelled my paid Orion plan.
What I came here to say is that I now, as a last resort, tried a completely new profile, this time WITHOUT 1password, even though it is for me as the OP - an absolute necessity. And lo and behold, it hasn't crashed for several days now. It appears to me that the 1password plugin was causing this for me. I have tried both the chrome and firefox plugins, with no difference.
Just mentioning this, hoping that this can be focused on since more people than me seem affected.