I installed Firefox 43 (32) on a Win 10 (64) system yesterday.
It said that Fiddler Hook (18.104.22.168?) was not verified for use with the browser.
Today the version of Firefox went to 43.0.1, same issue.
Altering xpinstall-sigantures-required allows to Fiddler to run but isn't comfortable.
Is there anything else that I can do to fix the signing issue?