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How do I get Sync off my computer without deleting all of Firefox?

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Someone managed to sync my computer to theirs after I foolishly left my computer somewhere. Now this person is watching everything I do and everywhere I go on my computer and changes my passwords whenever the mood strikes them! I didn't even know you could do this kind of thing, I am fairly new on computers. This is really making me uneasy and I would appreciate any kind of help with this.

This happened

Every time Firefox opened

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Tools > Addons - Extensions

Sync is an extension, highlight it and click the Uninstall button.