I was able to produce "newtab", [empty string], [arbitrary string], "1Passwords Chrome Extension ID (khgocmkkpikpnmmkgmdnfckapcdkgfaf)", and ugly [IDN/ACE prefixed domain names]. While everything is safely encoded (and that is the most important point here), I wonder whether a few of the aforementioned cases need some special treatment (e.g., by displaying a replacement string instead).
1Password Version: Not Provided
Extension Version: 0.7.5
OS Version: xUbuntu 16.04 - Chrome 59
Sync Type: 1Password for Families