If the Show StatusBar item in the Monitor with Fiddler menu is ticked, and Firefox’s View > Toolbars > Add-on Bar option is also ticked, Firefox’s status bar will show the current state of FiddlerHook at the bottom right: The menu offers the ability to change whether Fiddler is used as Firefox’s proxy, and permits you to launch Fiddler directly. When enabled, FiddlerHook adds a Monitor with Fiddler command to Firefox’s Tools menu. If you’d like to use FiddlerHook instead, enable it using Firefox’s Tools > Add-ons > Extensions screen, restart Firefox, and read on. If it is, no worries-the last two sections have shown you how to manually configure Firefox. However, over the years, Firefox has started disabling extensions by default, and you may find that your FiddlerHook extension isn’t enabled. This extension is meant to help simplify the configuration of Firefox to use Fiddler. You may have noticed that installing Fiddler also installs a Firefox extension named FiddlerHook. Visiting HTTPS pages in Firefox with Fiddler capturing will no longer show certificate error pages. With this change in place, Firefox will now trust the Fiddler root certificate. In the screen that appears, check the Trust this CA to identify websites box at the top, then click OK. In the Select File containing CA certificate(s) to import box, choose the FiddlerRoot.cer file that you saved to your desktop a moment ago, then click Open. In the Certificate Manager, click the Authorities tab, and the click the Import button at the bottom: Firefox’s certificate settings are found by opening Firefox’s Tools menu, clicking the Options item, and opening the Advanced settings. Next, we must import this certificate into Firefox’s Certificate Manager. This will create a file named FiddlerRoot.cer on your desktop. On the HTTPS tab, click the Export Root certificate to Desktop button at the bottom. Inside Fiddler, click Tools > Fiddler Options. To avoid this warning page, we can reconfigure Firefox to trust the Fiddler root certificate.įirst, we need a copy of Fiddler’s Root certificate. This message is shown because Firefox does not use the Windows Trusted Certificate Authority list it instead has its own list of trusted certificates. If Fiddler is configured to decrypt HTTPS traffic ( Tools > Fiddler Options > HTTPS), you will find that attempting to load a HTTPS page in Firefox yields a scary warning message: 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.
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