Managing personal Outlook.com account settings, security, and privacy
Hello,
despite that error message is supposed to be an minder serious issue, verify please weather problem persists using another browser.
Here it works using Opera without any problems. That is why I think Firefox got an issue.
However, one can alternatively type in address filed following URL to get access to outlook account:
That URL works on Firefox release 52.1.2 without errors.
hope it helps.
Thx.
o fr. Henry.