Add "status" column to flag broken or unsafe bookmarks

[cheburashka]

Recently when I've been sorting through my bookmarks, I notice that a number of sites I saved a while ago are defunct or worse, the URL has been taken over by a spam website. It would be nice if Firefox integrated a column that would notify me of the bookmarks status, e.g. a) the site seems good b) the site is dead or c) if the site is potentially unsafe. 

I see that others have suggested automatically deleting broken bookmarks, but I would personally find this confusing. I might not remember if I had saved the site or not, and I might keep searching for it, not knowing the bookmark was deleted. I would simply like to have more information so I can decide myself what action to take. 

[Jon]

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