What are different categories of certificates in Mozilla Firefox 47? I see Mozilla Firefox 47 lists certificates in 5 categories on Certificate Manager.

Firefox stores certificates in 5 categories. You can see them listed on 5 tabs on the Certificate Manager:

1. Run Mozilla Firefox 47 and go to "Tools > Options" menu.

2. Click "Advanced > Certificates" tab and "View Certificates" button. You see Certificate Manager with 5 tabs:

• Your Certificates - Stores your own personal certificates. Usually, you don't have any certificates that represents your identify.
• People - Stores personal certificates of other people.
• Servers - Stores certificates of website servers that could be validated by root CA. It seems to have two sub categories: "Lifetime = Temporary" is for certificates to be used termporarily as exceptions. "Lifetime = Permanent" is for certificates to be permannetly disabled (not trusted forever).
• Authorities - Stores root CA certificates that Mozilla Firefox 47 provided to you at the time of installation. Mozilla Firefox 47 updates will keep them upto date.
• Others - Stores any other certificates.

The picture below shows you 5 certificate categories in Mozilla Firefox 47:

⇒ "DigiNotar Root CA" Not Trusted in Mozilla Firefox 47

⇐ View/Remove Certificate Exceptions in Mozilla Firefox 47

⇑ Using Certificates in Mozilla Firefox 47

⇑⇑ Firefox Certificates Tutorials