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Firefox doesn't recognize account, even though other devices do

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My computer crashed and was rebuilt - I downloaded mozilla and tried to login to sync but it says the account doesn't exist, even though I had it pulled up on another computer. I unlinked on the other computer and opened a new account on my computer but want to know why it won't recognize my account that I know exists ...

thank you!

My computer crashed and was rebuilt - I downloaded mozilla and tried to login to sync but it says the account doesn't exist, even though I had it pulled up on another computer. I unlinked on the other computer and opened a new account on my computer but want to know why it won't recognize my account that I know exists ... thank you!

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hello nghna7t, in firefox 29 there has been an overhaul of the sync system. you cannot connect old sync accounts created before firefox 29 to new firefox installations.

Sync your Firefox bookmarks, history, passwords and more

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You can copy the files that you need to an USB stick and paste them to your current Firefox profile folder.

You can use this button to go to the currently used Firefox profile folder:

  • Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)