For instance, a vulnerability in one of these libraries can potentially put Firefox users at risk.Īlternatively, Firefox can use client certificates that have exportable keys if they are manually saved to a file and then imported into a Firefox profile. These third party libraries can cause stability issues with Firefox and are concerning from a security perspective.
Using Firefox to access a client certificate stored on a hardware token typically involves loading a shared library written by either the vendor of the token or another third party into Firefox’s process. These client certificates and private keys are often stored in hardware tokens or in storage provided by the operating system. This client certificate, combined with a signature from the private key corresponding to that certificate, allows the user to authenticate to the website. In some cases, such as corporate authentication systems, the server requests that the browser send a certificate back to it as well. When Firefox negotiates a secure connection with a website, the web server sends a certificate to the browser for verification. Starting in version 75, Firefox can be configured to use client certificates provided by the operating system on Windows and macOS.
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