Check favorites for broken or bad links. It checks for bad links and displays a report if it finds something. Check for 404 links, timeout links.
Please download manually working build which is still under review if you getting error "Nothing to scan" https://addons.mozilla.org/en-US/firefox/addon/bookmarks-checker/versions/2.3.0
Bookmarks Checker. Scan favorites for broken or dead links. Delete empty, and duplicate folders.
Check bookmarks for broken or dead/broken links. Add bookmarks that you do not want to be scanned to ignore list.
Scans for 404 bookmarks, Time-out links or 403 favorites.
Scan for duplicate folders. Scan for empty folders. Scan in several threads. Set timeout setting for bookmarks
All bugs and ideas, please, post here: https://fvdmedia.userecho.com/list/21650-firefox-extensions/?category=4942
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