This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

ابحث في الدعم

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

If I buy Kaspersky Internet Antivirus instead of using the free version, will it be acceptable to FF? Don't make me choose between you!

  • 3 ردود
  • 1 has this problem
  • 4 views
  • آخر ردّ كتبه Chris Ilias

more options

Tonight, after updating FF yesterday, there is a message that it has disabled my Kaspersky antivirus due to inadequate "signing". It is the free version of KIS. If I buy KIS, will it work? I will not use a browser that I cannot use KIS on. Don't make me choose, FF. You'll lose!

Tonight, after updating FF yesterday, there is a message that it has disabled my Kaspersky antivirus due to inadequate "signing". It is the free version of KIS. If I buy KIS, will it work? I will not use a browser that I cannot use KIS on. Don't make me choose, FF. You'll lose!

الحل المُختار

Mozilla has rolled-out a fix for this. The fix will be automatically applied in the background within the next few hours, you don’t need to take active steps.

In order to be able to provide this fix on short notice, they are using the Studies system. You can check if you have studies enabled

  1. Go to [=] > Options > Privacy & Security.
  2. Make sure Allow Firefox to install and run studies is check marked.

I you had it disabled, you can disable studies again after your add-ons have been re-enabled.

They are working on a general fix that doesn't need to rely on this and will keep you updated.

Read this answer in context 👍 0

All Replies (3)

more options

Hi labgramma, this is a temporary problem.

A critical Add-on-related certificate expired (which obviously should not happen). As a result, all verifications for that certificate are failing, preventing many extensions from being used, updated, or installed. So it's not your connection; it's everyone's connection.

The Add-ons team is working on a fix for this. Official updates are expected to be posted here:

https://discourse.mozilla.org/t/certificate-issue-causing-add-ons-to-be-disabled-or-fail-to-install/39047

Currently, the only workaround for the regular release of Firefox is to set your system clock back (for example, if your date is May 3, set to May 2; if your date is May 4, set to May 3). You might have to reinstall extensions after that, or maybe Firefox will detect the difference at your next shut down/restart. Changing the date may have other consequences, so I understand this option isn't ideal.

more options

labgramma said

there is a message that it has disabled my Kaspersky antivirus

Your Kaspersky antivirus software itself was not touched at all as the message was referring to the Kaspersky extension that was installed in Fx.

more options

الحل المُختار

Mozilla has rolled-out a fix for this. The fix will be automatically applied in the background within the next few hours, you don’t need to take active steps.

In order to be able to provide this fix on short notice, they are using the Studies system. You can check if you have studies enabled

  1. Go to [=] > Options > Privacy & Security.
  2. Make sure Allow Firefox to install and run studies is check marked.

I you had it disabled, you can disable studies again after your add-ons have been re-enabled.

They are working on a general fix that doesn't need to rely on this and will keep you updated.