When dark theme is enabled in Opera (49.0.2725.47), the extension icon doesn't adapt. This is the result:
1Password Version: Not Provided
Extension Version: 22.214.171.124
OS Version: Windows 10 Version 1703
Sync Type: Not Provided
@matteocontrini: Hmm. I'm not sure why the Chrome extension icon is not working in Opera only on Windows — it's just fine in Chrome, and in Opera on macOS:
But we'll see if there's something we can do about it. Thanks for bringing this up!