White Box/Blue background Rated 4 out of 5 stars

Miguel Garza is right -- I have seen the white box/blue background, too. It happened after I used the 'bookmark all tabs' option, creating a new bookmark folder containing four bookmarks. Disabling that folder from display restored the 3 columns. Yup, I know this isn't the place for support reports, but the support site link goes to a page that won't even display characters in my browser, and is not in the same language as this site...

This review is for a previous version of the add-on (0.6.7.1-signed).