This is a firefox extension to refresh your bookmarks when pages have moved or become stale.
This add-on does the following when you visit a bookmarked page:
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If the server returns an HTTP 400-499 error, it will suggest removing the bookmark. See Bug 8648.
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If the server returns a redirection, it will suggest updating your bookmark.
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If the page has a canonical link that is different from your bookmark, it will suggest updating the bookmark. See Bug 502418.
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If the hostname cannot be found or the host cannot be reached, then it will suggest removing the bookmark.
The suggested change is only acted upon when if you click on the notification.
The bookmark can be installed from https://addons.mozilla.org/en-US/firefox/addon/refresh-your-bookmarks/