Two devices - MacBook Air and an iPhone. Both run the latest Firefox application, respectively. Starting with both applications having the bookmarks synchronised. Next, the bookmarks on one of the devices, say the laptop, are changed - some deleted, new added, overall bookmarks folders edited.

Question: How is it possible to ensure that Firefox synchronisation will transfer the latest compilation of bookmarks, as edited on the laptop, to the mobile phone application and not the other way round, undesireably restoring the preceding compilation, instead?