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Amazon Seller Central "400 Bad Request" "Request Header Or Cookie Too Large"

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I get this multiple times per week and then have to delete all amazon.com cookies and relogin to everything.

Hoping someone has a solution as I would prefer to continue to use Firefox but this is getting very annoying.

I get this multiple times per week and then have to delete all amazon.com cookies and relogin to everything. Hoping someone has a solution as I would prefer to continue to use Firefox but this is getting very annoying.
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