If you forget to do so, Firefox will not load pages and instead show the following error message:

If you configure Firefox to use this Manual Proxy configuration, you’ll have to come back and revert these settings after you close Fiddler. This is the recommended configuration:Īlternatively, you may manually configure Firefox to send traffic to Fiddler by entering the IP address and port (by default, 127.0.0.) in the appropriate boxes: If you’d like Firefox to work like all other browsers, sending traffic to Fiddler when Fiddler is set to Capture Traffic, simply choose the Use system proxy settings option, then click OK.

You can manually configure Firefox to point at Fiddler.

You can configure Firefox to respect the system proxy settings.

At the top of the tab, click the Settings… button to the right of Configure how Firefox connects to the Internet. Configuring the Proxyįirefox’s proxy settings are found by opening its Tools menu, clicking the Options item, and opening the Advanced settings.

Configure Firefox to trust Fiddler’s root certificate.įortunately, both of these are simple tasks.

Configure Firefox to proxy its traffic to Fiddler.

To get Firefox running with Fiddler, you need to: That means that Firefox may require some additional configuration to work properly with Fiddler. Mozilla Firefox is unlike most Windows browsers in that it does not use the system’s proxy and certificate settings by default.

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