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Firefox Keeps YouTube data even after deleting cookies, site data

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I am logged out of Youtube, but for the past 3 days I've noticed Firefox Keeps YouTube data even after deleting cookies, site data. This happens in normal browsing and also in private browsing windows. Please help.

I am logged out of Youtube, but for the past 3 days I've noticed Firefox Keeps YouTube data even after deleting cookies, site data. This happens in normal browsing and also in private browsing windows. Please help.

Solución elegida

I'm not even sure where to look for that answer (sorry about my tech ignorance). But it's stopped now after the latest Firefox update, actually! :)

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Hi notthatgirlchick, what kind of YouTube data is Firefox keeping?

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Solución elegida

I'm not even sure where to look for that answer (sorry about my tech ignorance). But it's stopped now after the latest Firefox update, actually! :)