Yes, you can manually add the exported Fiddler root certificate to Firefox.
1. In Firefox open about:preferences#privacy
in a new tab.
2. Scroll to the bottom and click the View Certificates...
3. In the Certificate Manager
window click the Authorities
4. Click the Import...
button and in the Select File containing CA certificate(s) to import
file browser navigate to the FiddlerRoot.cer
file and open it.
5. A Downloading Certificate
dialog window will appear. Make sure that the Trust this CA to identify websites.
checkbox is checked and click the OK
6. Click the OK
button in the Certificate Manager window as well.
Now you should be able to open https://www.youtube.com while Fiddler is capturing HTTPS traffic.
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