Unable to Sign In to Previously Accesible Web Sites
What can I do to prevent Firefox from keeping me out of certain websites and showing this error message: Firefox Can’t Open This Page
To protect your security, www.ganjingworld.com will not allow Firefox to display the page if another site has embedded it. To see this page, you need to open it in a new window.
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This happens if a web page opens an external page in an iframe and the website prohibits this via CSP rules or via a X-FRAME-OPTIONS header in the HTTP response headers.
You can right-click the frame area with the error message and use "This Frame: Show Only This Frame" or "This Frame: Open Frame in New Tab" to display this page.
See the Web Console from more detail.