While the extension appears to do what it says, the resulting list of truncated bookmarks make it impossible to tell which specific bookmarks are being reported (and nothing about where in the bookmark folder structure they are located), the icons are ambiguous on what they mean (e. g., what's the difference between the two styles of arrows?), there is no display of what the errors were (just that errors were encountered), and the link to the support site is the github with the readme that points to the extension in AMO.

Quite simply, as it stands, I can't use this because I don't know just what it did besides visiting sites I had bookmarked, what actions it automatically took after visiting those sites, and I don't know what actions are taken when I click on some of the icons in the results list in the sidebar.