There is an addon for FF called
Bookmarks Organizerby Sören Hentzschel
<
https://addons.mozilla.org/en-US/firefox/user/1351101/>
With the Bookmarks Organizer it's easy to put order in your bookmarks.
The Bookmarks Organizer finds no longer working bookmarks, redirects,
duplicates and more!
About this extension
With the Bookmarks Organizer, it's easy to put order in your bookmarks.
The Bookmarks Organizer finds no longer working bookmarks, redirects,
duplicates and more!
*Bookmarks Organizer is a WebExtension and compatible with Firefox
Quantum (Firefox 60 and later).*
*Features*
* Finds no longer working bookmarks
* Finds duplicate bookmarks
* Finds bookmarks without name
* Broken bookmarks can be edited or deleted
* Detects redirects and offers the automatic correction of individual
or all redirects
* Whitelist feature to exclude bookmarks from future broken bookmark
checks
* Internal skip list for domains that are known as not validatable for
technical reasons
*Shortcuts*
The interface can also be accessed via the keyboard. For this purpose
the combination *Shift + F11* is reserved. Or you can open the interface
via a menu entry in the tools menu.
It is also possible to start individual tests directly via the address bar:
* *bookmarks organizer*: opens the interface
* *bookmarks duplicates*: search for duplicates
* *bookmarks empty-names*: search for bookmarks without name
* *bookmarks errors*: search for broken bookmarks
* *bookmarks redirects*: search for redirects