I am trying to use mitmweb as a proxy to audit some web front end performance issue.

However when I tried to connect to my work website, I got the following error:

enter image description here

Here is my proxy settings of Firefox:

enter image description here

Here is how I started mitmweb:

mitmweb -p 7999 --no-http2

I want to ignore this warning, but there is no 'Add Exception...' button available. How can I bypass this warning?

The OS is OSX 10.14.3


If a website has flagged HSTS, a properly implemented browser will honour the flag and will not allow the user to ignore the security risk.


To bypass this warning in Firefox click on the blue "Advanced" button, then click "Accept the Risk and Continue".

  • The option is not available, as shown in the screenshot in the question – Anthony Kong Apr 2 '19 at 9:12

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