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FireFox 70.0.1 (64 bit) Install on WIN10 lost practically all YouTube subscriptions

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After the install of FireFox 70.0.0 (64 bit) on my PC WIN10 system, when I activate YouTube.com, all (20+ subscriptions) but 1 saved subscriptions were lost.

After the install of FireFox 70.0.0 (64 bit) on my PC WIN10 system, when I activate YouTube.com, all (20+ subscriptions) but 1 saved subscriptions were lost.

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Correction: FireFox 70.0.1 (64 bit)

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Hi James, subscriptions should be saved in your Google/YouTube account and appear the same regardless of which browser you use to log in. Some users have multiple Google accounts; could that explain why you don't see the expected data?