Since there are mobile apps for most of the websites you use nowadays, we introduce the “Show on mobile” checkbox.
As you probably may have guessed, the ones that are not selected will not appear when accessing FavSync on your mobile phone.
You can find it in the edit bookmark menu.
This way when you access your FavSync page from mobile phone, you see only the bookmarks you really need for your mobile.
In case you want to see all the bookmarks, you can press on the computer icon at the bottom bar.