It doesn’t show ads. If you’re having issues, it seems you’re not keeping things updated or you’re using extensions that cause issues.
Sure they will. Guessing you either don’t have things on same sync chain or you didn’t choose to sync bookmarks. If you don’t choose the option on both devices, then it won’t happen. Of course, you could have also asked for assistance in which case we could have seen if there’s any other issue, such as discussed at Sync stops working randomly and cannot be restarted without new sync chain. (Bookmarks no longer syncing, send to device no longer working reliably either.) - #58 by Alexey