Sir, please also add a way to check if youtube videos have been deleted, thanks.

- this add-on correctly detected quite some dead bookmarks that '404 Bookmarks' add-on had not seen in this location. So very good.
- Dupes it detected were actual *folders*, so deleting them would have brought havoc in my bookmarks library. Not good.

A tool I was looking for a few years... Thanks !

I wonder if "exclusion of folders" could be a little more put forward (I accidentally removed bookmarks of intranet sites).

The generation of screenshots could be a nice feature. It would help removing another kind od of obsolete bookmarks: those whose answer indicates that the site has been moved.

There was a bit more manual interaction required than i would have liked (e.g. when it absolutely refuses to remove the last copy of a bookmark in batch mode, forcing the user to delete them individually). Also, the URL checker process pops up countless HTTP auth dialogs for sites which use HTTP Basic authentication. i'm not certain that this extension can avoid those, but it is irritating (i've got dozens of them). In any case, it's simple, clean, and easy enough to use, and it allowed me to go through and clean up a great many useless bookmarks.

I found 6k "broken URLs" out of 20k, but scanning through them, I can often see why: the link is an obscure & obsolete page within a useful site, so I need to be able to open the link properties & edit (shorten) the target address, but there's no option to do this, and no indication of where (what folder or subfolder) the bookmark is, so if I want to edit the links I'm going to have weeks of work ahead of me - and I'll need to save the result!
Suggestion: If an address is "broken", search again minus the last folder/page & offer that as an alternative address if it is alive.
Otherwise it seems to work fine.

Great addon. Could you add an "exclude folder" option. Many session restorer addons and similar ones use the bookmarks as a backup and duplicates on those folders are very frequent and required so it would be nice to be able avoid scanning that. Thank you. Also it would be great if you could add a way to contact you like a mail or github in case someone wants to request a feature or report a bug.