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Can not add exception to content blocking

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Trying to setup mightytext. There are instructions at http://help.mightytext.net/knowledgebase/articles/68509-allow-3rd-party-cookies-or-allow-exception-for-mi

Obviously written for an older version of firefox.

I am unable to add a site to exception list unless I visit it. However, when I visit those urls there are no options because it is not trying to set anything.

How do I just add the urls to the exception list?

Trying to setup mightytext. There are instructions at http://help.mightytext.net/knowledgebase/articles/68509-allow-3rd-party-cookies-or-allow-exception-for-mi Obviously written for an older version of firefox. I am unable to add a site to exception list unless I visit it. However, when I visit those urls there are no options because it is not trying to set anything. How do I just add the urls to the exception list?

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When I go to https://mightytext.net/app/ in a private window, Firefox's Content Blocking feature fires up. (The Trackers list show is blocking facebook.com.) If I make an exception using the main section of the drop-down, the page reloads and now redirects to a Google sign-in page. That's strange.

Is that at all like what you are seeing?