Trusted Browser Support is not working with Opera on MacOS

That was a typo on my part. Yes, it should be installed into /Applications. I've edited my post above.

1Password needs admin right to install and update from time to time. Typically, that's if we need to change some of the underlying structure. On Mac, all installations of 1Password must be placed in /Applications folder, which always requires administrative access to write too. If 1Password was to be installed in another location, some of the integration and security features we rely upon wouldn't work.

I'd recommend placing the browser there if possible. That's because we verify the code signing of the browser to make sure it's signed by Apple.

https://1password.community/discussion/140735/extending-support-for-trusted-web-browsers#latest