Firefox Error: “Software is Preventing Firefox From Safely Connecting to This Site”

 Issue

When opening Firefox, the following error message is displayed:

Firefox error about software preventing access to the site with a Go Back and Advanced button displayed

 Resolution

  1. Open Firefox.

  2. In the address bar, type about:config and hit Enter.

  3. When prompted to “Accept the Risk and Continue”, do so.

  4. In the preferences bar, type Security.pki.mitm_canary_issuer and hit Enter.

  5. Click the pencil icon next to the entry. Delete the whole line.

  6. Quit and relaunch Firefox. Load a webpage to confirm the error is gone.

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