I right clicked on the 1password icon and chose "Generate Password". A password item was created in the vault. That wasn't what I expected so I highlighted the new password item and clicked the right arrow icon. As expected, it opened 1password.com and allowed me to edit and then send the item to the trash. Meanwhile, though, the 1password extension did not recognize that I sent the item to the trash and continued to show the password item in the "suggested Items" list.
1Password Version: Not Provided
Extension Version: 0.9.8
OS Version: Ubuntu 14.04.5
Sync Type: Not Provided