Thanks for review. The easiest way to delete everything is just open Bookmark Menu (CTRL + SHIFT + B) and select the SessionSync folder and delete any folder you want from there (or all of them). Assuming that by deleting you really mean to remove them completely, that's the easiest way. Of course you can't really restore them after that. If you think you need them you can just move them elsewhere and they won't be showing anymore in the "Session" Tab