An annoying thing I'm noticing is that I repeatedly have to sign-in to my iCloud account in order for 1P to work with the Vivaldi and Brave browsers. Despite checking the box on "remember my decision," it pops right up the next time. THEN, the iCloud sign-in page changes to "synching" and shows the little arrow wheel spinning indefinitely until the tab is closed, which appears to make no difference to the actual sign-in to the web page that initiated this iCloud sign-in silliness.
1Password Version: 6.3
Extension Version: Not Provided
OS Version: 10.11.5
Sync Type: iCloud