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.

Avatar for Username

Search Support

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

This thread was archived. Please ask a new question if you need help.

"Kaspersky Protection could not be verified for use in FireFox and has been disabled" "Kasp.Protection 4.6.2.23.1 disabled" What does this mean?

  • 2 replies
  • 9 have this problem
  • 4 views
  • Last reply by James

pagurus
pagurus
more options

After this morning's FF update, I got this message. Has FF disabled my anti-virus?

Clicking on the "more information" link gets me to the page https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox?as=u&utm_source=inproduct

I do not understand what this all means. Can somebody please explain it in terms suited to the meanest understanding?

After this morning's FF update, I got this message. Has FF disabled my anti-virus? Clicking on the "more information" link gets me to the page https://support.mozilla.org/en-US/kb/add-on-signing-in-firefox?as=u&utm_source=inproduct I do not understand what this all means. Can somebody please explain it in terms suited to the meanest understanding?
Attached screenshots

All Replies (2)

FredMcD
FredMcD
more options

Make sure it's up to date.

Enter about:config into your Firefox address bar Click the I'll be careful button Find xpinstall.signatures.required in the list Right click the preference Select Toggle until the value is false

James
James
  • Moderator
  • Top 10 Contributor
more options

The Kaspersky extension needs to be signed.

A workaround to try for Firefox 43.0 until Kaspersky fixes their extension is to type about:config in Location (address) bar. Filter for xpinstall.signatures.required and double-click the preference, or right-click and selected "Toggle", to set it to false.

The completely separate Kaspersky anti-virus software is not touched in any way and should still be functioning normally.