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Since Firefox 39.0, getting "sec_error_bad_der" at Google sites

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  • 2 have this problem
  • Last reply by guigs

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Since I updated to Firefox 39.0, I keep getting "sec_error_bad_der" when trying to get to Google or Youtube:

Gmail does load, but not fully:

It happens intermitently. Yesterday I opened Firefox and it didn't load any Youtube videos or Google search site, and after a while, it suddenly started working - without reopening, clearing cookies or doing anything else than browse.

Today, it hasn't worked at all. I tried clearing history, cookies, restarting in safe mode, updating addons, disabling addons... Today nothing works.

Can you help me please?

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You might be able to also try two things: Temporarily disable the antivirus to make sure its not blocking part of the page. Also do this for the content blocking extension in your Firefox profile.

Second try a new profile to make sure its not something that has become corrupted in the cache of these pages: Profile Manager - Create, remove, or switch Firefox profiles