As no replies have been received, I have surfed the web and come up with AM Deadlink @ http://www.aignes.com/deadlink.htm
Copy of site product summary is :-
AM-DeadLink detects dead links and duplicates in browser bookmarks and text files. If a bookmark has become unavailable you can verify and delete it permanently. Additionally you can download FavIcons for all your Favorites and Bookmarks.
AM-DeadLink is Freeware!
AM-DeadLink can check the following resources:
- Internet Explorer Favorites
- Firefox bookmarks
- Opera bookmarks
- Chrome bookmarks
- HTML files
- URLs from tab delimited text files
- URLs from comma separated text files
I have now used this program extensively to so far delete many duplicates. On opening, the bookmarks are listed. Various actions are then possible using the icons provided. For duplicates, just click the icon and all duplicates are listed with an arrow against the first record (this is not deleted). They can then be sorted with all errors marked in red at the top of the list. A reason is given for the error.
Redirect - OK items are in blue and all the rest for action, in black.
Selective deletion of items can be done by holding the CNTRL key down and clicking the selections. You can select any number. When finished with the selected batch, just click the delete icon and wait for the program to finish. The total count of bookmarks is shown at the bottom.
IMPORTANT ! After selecting your batch of deletions, release the CNTRL key but DO NOT click on the screen or you will lose the lot and have to start again. Only click on the scroll bars or the appropriate delete icon.
So far I have deleted almost 3,000 bookmarks from my Chrome browser, with more to go. For some reason, Chrome has many individual duplicates per item. This may be the result of importing from IE and Firefox.
Anyhow, I am happy now and consider the matter closed.
Edited by yabbadoo, 20 June 2013 - 12:05 PM.