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I still cannot access my Thunderbird email since the Firefox 47.0.2 download three days ago, and I need help!

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My laptop now shows I have Firefox 50! I need to go back to the version before Firefox 47.0.2 which incapacitated my Thunderbird email and stop future update requests. Please help me with this.

My laptop now shows I have Firefox 50! I need to go back to the version before Firefox 47.0.2 which incapacitated my Thunderbird email and stop future update requests. Please help me with this.