AM-DeadLink is a useful application that can detect dead links and duplicates in your browser bookmarks.

If a Bookmark has become unavailable, you can then verify it via the internal preview and delete it from within your browser. Additionally, you can download/update the FavIcons of all your Favorites from the Browsers Internet Explorer and Opera.

AM-DeadLink only checks your browser bookmarks and bookmark lists for valid/invalid URLs.

AM-DeadLink is capable of checking URLs from the following:

Tab delimited files
CSV files
HTML files
Chrome bookmarks
Firefox bookmarks
Vivaldi bookmarks
Internet Explorer Favorites
Opera bookmarks