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Cannot sync neither Firefox nor its extension

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I encountered two problems that seem to be connected. My Firefox Sync is unable to sync passwords and extensions across my two computers (bookmark syncing is working). At the same time, I cannot get my Zotero extension to sync its data across computers.

I suspect these problems are interconnected. I am using Win 8.1 standard settings, Avast antivirus, newest version of Firefox.

Please could anyone help?

I encountered two problems that seem to be connected. My Firefox Sync is unable to sync passwords and extensions across my two computers (bookmark syncing is working). At the same time, I cannot get my Zotero extension to sync its data across computers. I suspect these problems are interconnected. I am using Win 8.1 standard settings, Avast antivirus, newest version of Firefox. Please could anyone help?

Chosen solution

It was caused by some corrupted files. Solutions: I reset Firefox to factory settings.

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It was caused by some corrupted files. Solutions: I reset Firefox to factory settings.