Changes

* [https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings Refresh Firefox button] -- Recommended way to restore the security certificate settings.Read * [https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean this Support article#w_corrupted-certificate-store Manually restore the security certificate settings] on how to delete the <tt>cert8.db</tt> file-- only perform as last resort.