Bookmarks of Firefox Sync lost & Request to restore Firefox Sync data

I'm using "Firefox Sync" to sync the bookmarks between a desktop and a tablet.
On the desktop, the bookmarks include 2 parts:
# all bookmarks by "Firefox Sync" is updated to "Mobile device" folder;
# another part is bookmarks that only add/change by desktop and is unchanged by "Firefox Sync".
Last night, "Mobile device" folder on the desktop lost, but other bookmarks exist. since I haven't used the tablet and synced with the tablet for a month, all new bookmarks in "Mobile device" folder lost and cannot find out from the tablet. The bookmarks includes my important research; thus, I really want to get it back.
I've tried the following methods, but it still doesn't see "Mobile device" folder:
* sync bookmark with the server (I'm afraid that the blank already replaced the data on the sync server)
* restore the autosaved bookmarks file *.json
* move places.sqlite to another computer
Does Firefox backup their Firefox Sync Server everyday? Would I request Firefox Support to restore my Firefox Sync data on the server back to 3 days ago? Thanks!

Thank you for your reply. It's so sad to hear that it cannot restore data back to 3 days ago. I've checked the tablet and the desktop, it cannot find out the data. I only blamed myself that I didn't backup the bookmarks...and I need to do it from scratch.
But I haven't understood why the bookmarks disappeared in the desktop without any error. I've just updated Firefox from 8.0.1 to 15.0.1, I hope it'll not happen again.

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I lost my Sync Key on my Desktop Firefox, but i still have it on my Firefox Home (IPhone 4). Is there a way to restore it/show it on the mobile device?

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Hi,
Sorry to read that. Unfortunately, because of security reasons, there's no way to retrieve your Sync key from any mobile device. That's why it's really important to keep a secure back up of it.
The only remaining option at this stage is to save your bookmarks on the phone and manually migrate them to your computer. Once you have done this, reset your account.

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I did read what you posted, and will point out once more - the organised bookmarks were kept, the unsorted - the majority - were lost. I tried accessing them THROUGH sync as I couldn't find them before I started sync and thought that might help. Really didn't. Sync was only loaded with version 6, never used it on 3. Updated from 3 to 6; tried to find bookmarks. All unsorted ones GONE. accessed sync; no bookmarks. went back to three. never shifting again, version 6 is a quick trip to hell. Should have known not to trust the program to preserve bookmarks, blame myself for being so bloody stupid to trust it to keep my information safe. Moral: always save multiple backups.

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I was on live chat with a Norton specialist and they deleted/reinstalled my Firefox so fast that I didn't even have time to ask him if he saved my bookmarks. When I did ask him about the bookmarks, he said he was not trained in Firefox, but that the bookmarks could be restored.
I've attempted to restore the bookmarks as directed, but they give me the current date 2/13/13(reinstall date) of which I don't have any bookmarks? How do I recover my bookmarks? Do I need to restore my pc to an earlier version?

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https://support.mozilla.org/en-US/questions/952818?esab=a&s=old+profile+folder&r=3&as=s
and
https://support.mozilla.org/en-US/kb/Recovering%20important%20data%20from%20an%20old%20profile?esab=a&s=retrieve+bookmark+kb+files&r=0&as=s#w_your-important-data-and-their-files

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Dozens of open tabs lost! Synced them, reinstalled Windows and Firefox, set up Sync, looked up "tabs on other devices" in history -> Only a third or so listed.
Usually, when I reinstall Windows, I manually backup my Firefox bookmarks and open tabs, but because Sync has worked perfectly for me in the past, I didn't do it this time. I backed up all my other files and settings and whatnot from the rest of my system, then in Firefox I hit the Sync button (put in on the GUI so I see if it's syncing or done) for the last time, waited until the green rotating dot was gone, closed Firefox, shut down the system, formatted the drive and reinstalled Windows and Firefox. After setting up Sync I waited a while to make sure everything is on my system.
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-> Maybe about two thirds of the tabs I had open on my old system are gone!
Not just new tabs that might not have been synced (although the button showed sync was complete), but also old tabs (from weeks ago) that must have been synced before. Actually maybe especially or even only the old ones are lost. And the lost tabs are not just from one of the open windows, but from several.
What can I do to recover my lost tabs?
They contain important websites that I didn't bookmark yet, articles that I wanted to read, windows with dozens of tabs on a topic that I did some research for and stuff like that.
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Further info:
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Sync lost my bookmarks

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Hi... I am running a dual core, Win7 64bit PC, with Firefox Regular and Nightly on it... I also have 32bit Win XP Virtual PC on the same PC with Regular Firefox... How do I sync all of them to give me the same bookmarks, history, cookies and passwords ???

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Bookmarks of Firefox Sync lost & Request to restore Firefox Sync data

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