Unable to log into websites with Firefox, says the username or password is incorrect

Unable to log into websites with Firefox, says the username or password is incorrect I cannot log into my google account from Firefox. I put in my user name and password and it tells me
Asked by: Guest \| Views: 316

Total answers/comments: 1

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Guest [Entry]

"If you're able to log into other sites, but just can't seem to log into one in particular, check to see if you're blocking that site specifically.

Tools > Options > Privacy

In the Cookies section, make sure that you've checked:

Accept cookies from sites

Then click Exceptions

See if you already have an entry for a site, and if so, whether or not it's blocked. If it is, you can either remove it or just add it in again with Allow.

Then close the Cookies dialog box and OK the Options dialog.

You should now be able to log into the site(s) you were unable to previously."