After daily package update firefox is unnable to connect to any https server, like www.google.com, ubuntu.com and so on. To ask this question I needed to install konqueror to be able to enter https web site. No matter what certificate files I've added - no change: error on certification for any https connection and firefox is completely unusable.

  • Did you try sudo apt-get update and sudo apt-get upgrade? Also try sudo apt-get purge firefox and sudo apt-get install firefox. – Cammy_the_block Mar 28 '16 at 14:46
  • I did it as first option and it didn't help. Moved to QupZilla browser which can hendle all issues with certifications. – user523913 Mar 29 '16 at 8:43

Be sure to check that your system's date and time are accurate. This can cause issues when validating certificates and have them show up as invalid.

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  • The date and time are accurate. It is not the problem. – user523913 Mar 29 '16 at 8:45

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