Firefox error "sec_error_unknown_issuer"

After years and years of using Firefox, I decided to leave it and start using Google Chrome.
Why ?
Because Firefox returns error "sec_error_unknown_issuer" very often, when I access to my usual websites.
Something must have been wrong with last Firefox update.
Getting these SSL errors on every other site is starting to really get annoying! There is nothing wrong with the SSL certificates or the sites. It's your browser that is unable to verify the certificates.
When you fix it, maybe (only maybe) shall I return to Firefox.
Have a good day.

hello, this is most probably caused by external factors and a possible solution depends on different factors. please attempt to add an exception on the bottom of the error page & inspect the certificate (see the screenshot attached for instructions):
<br>which '''issuer information''' does the certificate contain?
thank you!
[["This Connection is Untrusted" error message appears - What to do]]

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hello raviparekh027, thanks for providing the screenshots.
as this problem might have different external causes please provide another piece of information:
when you attempt to add an exception on the bottom of the error page (don't do it for real though!) & inspect the certificate, '''which issuer information''' does the certificate contain? (see screenshot)
thank you!

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I'm running the latest version of Firefox on Windows 7 Home Premium. I use Kaspersky antivirus.

Kaspersky has a feature to scan your web traffic and when it wants to scan HTTPS connections it needs to intercept and decrypt the traffic, which requires presenting Firefox with a fake certificate.
This support article has the steps for setting up Opera by importing a certificate file generated by Kaspersky, and it's most similar for Firefox:
http://support.kaspersky.com/us/9093#block1
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From Firefox nightly trying access https://support.mozilla.org/questions/912835, I get the Connection is Untrusted message.
Technical Details
support.mozilla.org uses an invalid security certificate.
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(Error code: sec_error_unknown_issuer)

Check the date and time in the clock on your computer: (double) click the clock icon on the Windows Taskbar.
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Doublechecking, Dad:
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Error
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Hi jwittlock,
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Firefox error "sec_error_unknown_issuer"

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