javascript - Facebook SDK FB.GetLoginStatus Load denied by X-Frame-Options (Firefox Only) - Stack Overflow

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I have this web application login page that calls FB.GetLoginStatus() from the Facebook JavaScript SDK after the document is done loading. This worked perfectly fine on all browsers (mobile included) and that was the happily ever after.

BUT, one day, out of plain nowhere, I notice that the SDK is failing to get the login status data of the Facebook user when the page is done loading. I take a look in the console and I see something around the lines of

Load denied by X-Frame-Options [massive link generated by the SDK] does not permit framing.

Here's what bugs me: this works perfectly fine in Safari. I was introduced to the error when I opened the web app on Chrome (same error as quoted above, slightly different wording). I tried on Firefox and got the same thing. I spent a few hours trying to find a cause but failed and went to sleep.

I wake up the next day and miraculously it's now working on Chrome (?) without me having done any changes (?!). But, for some reason, the error persists only in Firefox now.

Does anyone have a clue what this might be? Something that Firefox does differently that Safari and Chrome don't?

A clue here is that I'm using a tunneling service (ngrok) and I don't have a signed certificate for it, thus I get the casual (you're entering an 'unsafe' website, blah blah blah). Perhaps Firefox is blocking the SDK because the connection is not secure?

Any insight on this would be marvelous. Thanks

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