Firefox kerberos 401.2 error

Scenario:
We have an intranet sharepoint site using kerberos authentication. The site works perfectly in IE but displays 401.2 authentication error when opened using Firefox.

Resolution:
- Open Firefox
- Type about:config in address bar
- Filter by keys which begin with "negotiate"
- Set the below key values,
-- network.negotiate-auth.delegation-uris = "comma seperate list of domains e.g. '.mydomain1.com, .mydomain2.com' "
-- network.negotiate-auth.trusted-uris