Hi, Thanks for the detailed report and large-scale test case.

I'd like to narrow down where the slowdown is occurring. Could you share a bit more about the workflow you used?

- Did you manually select bookmarks for deletion, or use one of the quick-select modes?
- If quick-select was used, which option was it?
> First occurrence in same folders
> Last occurrence in same folders
> First occurrence
> Last occurrence

- Approximately how many bookmarks were selected for deletion at once?
- Does the slowdown happen during the actual deletion step, or afterward while the extension refreshes/re-scans the bookmark tree?
- Does Firefox become temporarily unresponsive, or does it continue working but remove bookmarks very slowly over time?

This will help me narrow down whether the bottleneck is related to bulk deletion handling, UI refreshes, or post-delete duplicate re-scanning on very large bookmark collections.

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