To be honest I haven't tested it on anywhere near that quantity of bookmarks, so I'm not entirely sure how well it'd perform.
My suggestion would be to either wait for the extension to mature a little bit before testing it, or to export your bookmarks first so you have a backup. The extension itself is non-destructive in that it won't delete your bookmarks, but there may well be undiscovered bugs that could mess up your current organization of bookmarks, etc.
My suggestion would be to either wait for the extension to mature a little bit before testing it, or to export your bookmarks first so you have a backup. The extension itself is non-destructive in that it won't delete your bookmarks, but there may well be undiscovered bugs that could mess up your current organization of bookmarks, etc.