Log in Issue
Firefox is not compatible with vanguard.com. Cannot log into that site. Why?
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V122.0 I just tried it and was able to log in OK. The only thing I noticed was that it asked me again to enter a security code and check whether I wanted to do this in the future. Maybe something lost in a cookie?
Try clearing site cookies and disabling Tracking Protection for the site.
Does it still happen in Troubleshoot Mode?