Good tool for fix URLs or fix parts of the URL, but on complety dynamically generated URL for static website content it fail.
e.g. searching for jobs on https://jobboerse.arbeitsagentur.de.
but this could be solved with saving with unique strings (reference-number) on the website.
Then this duplicates could be found with replacement the dynamic parts of url and a filter ofexpression for name and URL.

now my summary of things good and bad:
(+) very performant
(+) very mighty filtering with regex to find duplicates
(-) it is not very inituitive , a complete debug log in a text file or browser should be usefull
(-) the combobox and the regarding Button are not intuitiv to, a quick improvement could be put the combobox and reagrding butting in a border toshould that it belongs togehter
(-) if no special filter fits or deep subfolders it could be in some case it could confusing , show only bookmark name on the link could help (switchable: Full path bookmark name / short bookmarkname)
(-) i think the the system of local and sync storage is not so good. better where a default profil and create some profiles if the user need and a combo-box to use the filters of the of the selected profile

Feature i really miss is following:
- If I look or filter for duplicates i often would rename a bookmark but then go in the bookmark mangemnet or dive in the subfolder and use the context menu to change to properties is very elaborate.
- export / Impo settings
- creatable and selectable profiles for different filter settings

If thsi feature will implemented i will give 5 points