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Just today, all the sudden my Firefox can't access to Gmail. When I try to login to my Gmail, it will shows:

Corrupted Content Error 
The site at https://mail.google.com/mail/u/0/ has experienced a network protocol violation that cannot be repaired.
The page you are trying to view cannot be shown because an error in the data transmission was detected.

I have tried clear all the cache and cookies, and even start my Firefox in safe mode, I am still getting Corrupted Content Error message when I login to my Gmail account. However, I am able to access it when I open my Gmail in Firefox private window.

What causes it? How can I fix it? Or I have to switch to Chrome browser in order to use Gmail?

migrated from superuser.com Nov 16 '18 at 22:09

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I just found that by using Ctrl + F5 will help to solve the problem.

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    Terrific solution. Thank you. – Tom Raywood Nov 20 '18 at 5:33