Couldn't be simpler. I installed, ran the extension from the extensions overflow menu, and it sorted through my 90,000 bookmarks in a fairly reasonable time.

Dang there's a lot of dead sites :(, I am still confirming most of them (and will be for a while!) but it makes me sad to see so many resources and websites gone.

これは便利！

To launch: in "Extensions" (puzzle icon). Does what it is designed for

Meilleur que l'autre avec plus d'abonné(e)s; l'autre me donne pleins de liens qui sont encore bons comme étant des erreurs.

This Addon is awesome! Does exactly what is needed and possible, I was looking for something like this and its actually there!

I am quite shocked how many of my bookmarks are offline... like the web was dying.

Also very useful on TorBrowser to see if onion sites are down.

Still works!

Excellent program. Easy to use, quick, highly recommended.

特别实用的功能，有效帮我筛出失效书签，要是能显示我的中文分类名称就更好了。

Simple, worked well.

That's so awesome I wish I had money to throw at you guys!

Works as advertised!

I use this handy addon to get rid of all unwanted bookmarks.
Will be hepful if various error codes are handled in different sections.
also many urls with network error are working, maybe you should wait before requesting new outgoing connections ?