"Firefox Can't Open This Page" warning

[dbator]

Hello,

while trying to open mailbox settings (web.de, 1&1 Media GmbH) I see pictured warning. Opening the address in a new window as suggested does not work. Clearing site data like cookies etc. does not work either.

Any suggestions?

[Agentvirtuel]

Hello

The best for more opinions
You can contact Firefox Community Forum
https://support.mozilla.org/en-US/questions/firefox

Website will not allow Firefox to display the page
https://support.mozilla.org/en-US/kb/xframe-neterror-page

If you want to try Ignore X-Frame-Options Header
https://addons.mozilla.org/firefox/addon/ignore-x-frame-options-header

For illustration
https://www.youtube.com/watch?v=IyCsGZ0_JbY

[dbator]

They just changed layout of web mailbox - probably that's why that link was temporarily not working. Currently layout looks different and I can open mailbox properties now.

Thank you for the response anyway.