I get so many false positives that it becomes really annoying. And there's nothing I can do. I double check the site, the link is correct, it isn't a redirect but comes back as broken. It will be nice to be able to whitelist these mistakes made by the checker. It stalls at the last link from time to time which is also a problem. (Firefox 57, about 540 bookmarks) I originally gave this three stars a while back but it still does a terrible job. About 35% of bookmarks come back as errors. Even after replacing so-called redirects with suggested alternatives it comes back as an error. It's much easier and better to save bookmarks as an html file and check with standalone link checker. I use Xenu. Thee errors went from 177 out of 540 to 11, which were true redirects I wanted to keep.