How to copy digital certificate
How to Export a PFX File from Firefox
A PFX file contains all the information that makes up an X.509 Digital Certificate that can be used by PentaPDF-PRO to Digitally sign PDF files.
PKCS stands for Public Key Cryptography Standards that were developed and published by RSA laboratories.
The PKCS #12 Standard defines the Personal Information Exchange Syntax Standard. This defines a file format commonly used to store private keys with accompanying Public key certificates protected with a password-based symmetric key. Firefox calls the files that contain Digital Certificates .P12 files (that is called .PFX file by Internet Explorer). A .P12 file contains all the information that makes up an X.509 Digital Certificate based on PKCS#12 that can be used by PentaPDF-PRO to Digitally sign PDF files.
Once you have acquired your Personal Information exchange certificate (commonly called "Email certificate") perform the steps
Firefox has you access your Digital Certificates through the Tools menu - item Options .
The resulting screen shows numerous choices.
You will need to seled the Advanced Section and then click on the Security Tab.
On the Security Tab you will then press the View Certificates button.
Pressing the View Certificates button will make a screen appear that will show the currently stored Digital Certificates.
Firefox "Backup ". Firefox uses the term "Backup" to define exporting a Digital Id Certificate in file format.
It is called the Export procedure by Internet Explorer).
You will be prompted to enter the password for the certificate you want to Export (or "Backup")
You will be prompted for a file name.Source: www.pentaware.com