Follow the instructions below and Firefox will not splash its password prompt for internal sites.
- Firefox version < 13
- Open Firefox
- In the Address bar type about:config
- In the filter field type ntlm
- Double click network.automatic-ntlm-auth.trusted-uris
- In the prompt that comes up, type a list of server you want to allow, separated by a comma and a space. For example, if you wanted to allow http://company1_server and http://company2_server, you would type in company1_server, company2_server
- Click OK
- In the filter field type negotiate-auth
- Double click network.negotiate-auth.trusted-uris
- Set the same value as above
- Click OK
- Restart Firefox.
- Firefox version >= 13
- Open Firefox
- In the Address bar type about:config
- In the search/filter field type ntlm
- Set network.automatic-ntlm-auth.trusted-uris to .company_name.com
- Set network.automatic-ntlm-auth.allow-non-fqdn to true by right-clicking and selecting "toggle"
- In the search/filter field type negotiate
- Set network.negotiate-auth.trusted-uris to .company_name.com
- Set network.negotiate-auth.allow-non-fqdn to true by right-clicking and selecting "toggle"
- Click OK if present
- Restart Firefox.
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