Sorry, I don't understand your question (google translate tells me it's about Sync). Could you clarify?

Thank you for your reply. pool English, sorry. --- I reinstalled my OS, and I installed Firefox. setup Sync, and wait it to sync my data. Then, my Bookmark is not sync to my firefox. as well as password, history. It's all empty. --- So, I choose reset sync. use my sync data replace the data in my firefox. It not works, Either. also empty. --- I open my another computer, this computer's firefox is sync all the time. I reset this computer's firefox sync to replace my sync data. and then I open my firefox in the computer I just reinstall It's OS, and reset sync again. this time, my bookmark is synced. but the history, password is not. --- could you help me? thanks again.