I recently reinstalled windows. Then I installed firefox and after logging in I tried to sync my old data. But nothing is syncing. I had a lot of bookmark saved but they aren't coming back. I tried reinstalling, Logged in through mobile but nothing. Seems like it all got deleted somehow. Now How can I get back my data(bookmarks, extensions etc)?
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Thank you for your question about the Firefox Sync service.
It appears from your question, that you are using Firefox Sync as a back up service. This is not what Sync is designed to do. The Firefox Sync service takes a copy of the data you wish to include and transfers it to a second device (typically a mobile device such as a tablet or a telephone) running a copy of Firefox. The storage in between all attached devices is both temporary and fragile and is not stable enough to be (and is not designed as) a reliable backup service.
If you have a copy of your Firefox profile for desktop Firefox, you may be able to recover your bookmarks and other data. Please have a read of this article.
If you have a copy of your data on a mobile version of Firefox, please follow these instructions to connect it to Firefox Sync to copy your data.