FireFox SSL Certificate Errors (Stupid Popups)

August 21st, 2008 | by GTD Wannabe |

For some reason, I kept getting popup dialogs every time I ran into a certificate problem, e.g.,

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instead of the supposedly normal web page:

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Notice that the web page has an option to add an exception, while the popup does not. It’s possible to add exceptions through options/advanced/whatever, but it’s easier this way.

I finally figured out how to fix it, based on some arcane tips buried deep in a Mozilla forum that helped. The key is to turn on the browser.xul.error_pages.enabled flag in the FireFox settings. To do this, go to the URL about:config in your FF browser. If necessary, agree to the warranty warning. Then use the filter to find the right flag. Double-click it to change it from false to true.

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Now you can get an invalid certificate error, and still continue on.

  1. 3 Responses to “FireFox SSL Certificate Errors (Stupid Popups)”

  2. By Balu on Aug 21, 2008 | Reply

    browser.xul.error_pages.expert_bad_cert = true

    This unhides the “add exception” button on the SSL error page, allowing users to directly accept a bad certificate.

    browser.ssl_override_behavior = 2

    While this pre-populates the current URL and pre-fetches the certificate.

    Makes adding exception a lot easier :)

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