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I deleted my Sync account, but when I open Firefox the Sync tab still opens. How do I get rid of this?

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Whenever I launch Firefox the tab with the name "Your First Sync" still opens even though I've already deleted my Sync account. I do not want this tab to open anymore, it's actually very annoying. What can I do?

Whenever I launch Firefox the tab with the name "Your First Sync" still opens even though I've already deleted my Sync account. I do not want this tab to open anymore, it's actually very annoying. What can I do?

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You can check for problems with preferences and try to rename or delete the prefs.js file and possible numbered prefs-##.js files and a possible user.js file to reset all prefs to the default values.