Cannot log on to this website with Firefox 96.0.2 https://investor.vanguard.com/my-account/log-on
Cannot log on the above website with Firefox 96, as stated on subject line. Can do so with Microsoft Edge.
Solution choisie
I don't know whether it's relevant, but some sites try to block password fillers by requiring you to physically type in their form. Possibly adding a space after the text and deleting it might be enough.
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scotsman2 said
Cannot log on the above website with Firefox 96, as stated on subject line. Can do so with Microsoft Edge. Operating system is Windows 10.
Partially solved. Remove stored logon data and enter data manually, it works. This is unnecessary in Microsoft Edge. Something in the Firefox password vault must not be compatible with this website.
Solution choisie
I don't know whether it's relevant, but some sites try to block password fillers by requiring you to physically type in their form. Possibly adding a space after the text and deleting it might be enough.
Other users have reported the same problem and did the same as you to fix the issue.
Like some others, I found that if I deleted and retyped the last character on username and password it worked.