What specific Opera version is shown at the URL opera://about
Opera One(version: 113.0.5230.86)
macOS or Windows or Linux?
Windows 11
Is https://chromewebstore.google.com/detail/1password-–-password-mana/aeblfdkhhhdcdjpifhhbdiojplfjncoa the correct link to the extension you're using?
Yes, that's the correct extension
Does the 14-day free trial at https://1password.com/ require a credit card?
Not sure about this