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

  2. Open Firefox.

  3. In the address bar, type about:config and press Enter.

  4. When asked to “Accept the Risk and Continue," agree to it.

  5. In the preferences bar, type Security.pki.mitm_canary_issuer and press Enter.

  6. Click the pencil icon next to the entry and delete the entire line.

  7. Close and relaunch Firefox. Open a webpage to check if the error is resolved.

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