Configuring Mozilla Firefox to Use a PAC File

Configuring Mozilla Firefox to Use a PAC File

To redirect your web traffic to the Zscaler cloud, configure your browser to use a Proxy Auto-Configuration (PAC) file. A PAC file is a text file that directs a browser to forward traffic to a proxy server before going to the destination server. The Zscaler service hosts a default PAC file that uses geo-location technology to forward traffic to the nearest Zscaler Enforcement Node (ZEN).

To learn more, see How do I use default PAC files to forward traffic to the Zscaler service?

The following steps describe how to configure Mozilla Firefox to use a PAC file. The browser version used in this example is Mozilla Firefox 49.0.1.

To view the default PAC file:

If you were provided a PAC file URL, skip the first two steps.

  1. Go to Administration > Hosted PAC Files.
  2. Copy the URL of the default PAC file for the Web to your clipboard.
    See Image.
  3. Open Firefox and open the menu, then click Options. The Options window appears.
    See image.
  4. Click Advanced, then click Network. In the Network tab, click Settings.... The Connection Settings window appears.
    See image. 
  5. Select Automatic proxy configuration URL and paste the PAC file URL that you copied in step 2.
    See image. 
  6. Click OK to save the configuration.

For more information about getting started on the Zscaler service, see the Zscaler Quick Start Guide.

Screenshot of Hosted PAC Files page highlighting the URL of the default PAC file

 Screenshot of Firefox settings highlighting the Options icon

 Screenshot of Network page under the Advanced settings tab. Settings button highlighted

 Screenshot of Connections Settings window on Firefox highlighting Automatic proxy configuration URL button. PAC URL is entered in the field.