FF57 prevents me from logging into savings banks, writing tweets

Since FF57 i can no longer log into my saving bank. If I want to use Twitter, I read ‘Your account may not be allowed to perform this action. Please refresh the page and try again.’ and have to use Chrome or so.- I miss the developer tools, but perhaps I will adjust to this change.-
How may I resolve the question with the banks and with Twitter?

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Twitter

Your account may not be allowed to perform this action. Please refresh the page and try again.

I had that, or something like it, recently with Waterfox. It probably began after I experimented with Referrer Switch.

Worked around today by using the extension to re-enable the header.