WOW!!! Now why on earth would anyone ever want to delete all copies of anything that is duplicated? Why is that even an option? I assumed it would delete copies and leave one behind but mark all just deleted all copies. I have in the past used multiple browsers so bookmarks differ and every now and then I export import across them, (I'm fickle and easily swayed to switch a browser) which makes multiple copies of everything. Now close to 50k in bookmarks I thought I'd clean them up and this addon just wiped everything except for a couple hundred that weren't duped at all. If I had two copies it removed both of them. I could have just deleted all my bookmarks bar a few in way less time. Now I have to go remove the last few and a ton of empty folders and re import the mess again and find something that doesn't do what yours just did. Why is merging duplicate folders and bookmarks so dang hard? Well at least your addon didn't just freeze my browser like the one I tried on edge did even after i cancelled the operation I had to use task manager to close the thing