You often have different needs on your phone to your tablet or desk top or work computer. While you probably want to sync all your passwords across devices. you might prefer different bookmarks on your toolbar for work versus home versus phone. It would be great to be able to sort bookmark groups separately between devices. So my work bookmark toolbar has 8 bookmarks my home desktop bookmark toolbar has a different 13 bookmarks my ipad has 9 bookmarks similar to my home desktop my phone has 5 bookmarks i NEED quick easy access to on-the-go. Personally i have a different firefox accounts for work and home. But I don't really want ANOTHER firefox account for my phone, since i want all those passwords always synced across all my devices.