If you are used to saving a lot of web pages as bookmarks in your browser Favorites, you will find that over time many of them are inactive or redirect to other content, and it is common for us to save the same webpage more than once.
The solution to this problem is provided by extension Bookmarks clean up, which checks your bookmarks and shows you the results of duplicate and dead URLs (Urls with error code 403,404, 502, 503, request time out etc) which we can select and delete at will.
It also removes empty Favorites folders and merges duplicates (a common occurrence after bookmarks are imported from another browser).
- For users Firefox
https://addons.mozilla.org/el/
- For users Chromium/Edge etc (chromium based)
https://chrome.google.com/
After installation it shows the icon in the browser toolbar (two blue diamonds)
Click Open bookmarks manager and make a copy if you want.