Is Kaspersky Protection 2021 safe to use?

Kaspersky Protection 2021 has a security risk score of 100/100 (CRITICAL risk). Our security analysis detected 302 findings. Review the detailed security assessment below to understand the specific risks before installation.

What are the security risks of Kaspersky Protection 2021?

Based on our automated security analysis, Kaspersky Protection 2021 presents critical risk level. The extension is analyzed for malware patterns, secret exposure, network communications, permissions, and supply chain vulnerabilities.

How is the security score calculated?

Risky Plugins calculates security scores using weighted categories: severity of findings (25 points max), malware detections (35 points), secret exposure (28 points), network communications (10 points), and obfuscation (10 points). Scores range from 0-100, with higher scores indicating greater risk.

What does CRITICAL, HIGH, MEDIUM, LOW, MINIMAL risk mean?

CRITICAL (80-100): Severe security issues like malware. HIGH (60-79): Significant vulnerabilities. MEDIUM (40-59): Moderate security concerns. LOW (20-39): Minor issues. MINIMAL (0-19): Very low risk. Always review findings before installing any extension.

Is "Kaspersky Protection 2021" on Firefox Add-ons Safe to Install?

Name: Kaspersky Protection 2021
Availability: InStock
Rating: 4.6227 (5513 reviews)
Author: Kaspersky

Kaspersky · firefox · v2.14.56.9

The extension helps you manage protection without distracting you from what you're doing. It lets you access the protection management features right in your browser window. The set of features the extension helps you with depends on your subscription plan. Safe Money protects your data from interception when you make online payments. In some cases, the extension speeds up and enhances its work. Private Browsing informs you when websites are collecting your data and lets you restrict them if you want. It's much easier and faster from the extension menu. Anti-Banner blocks annoying pop-up ads on websites. With the extension turned on, it can detect and block even more banner types. Safe Browsing prevents you from visiting dangerous websites. Empowered with the extension, it notifies you of its work in a more convenient and timely manner in some cases. The Kaspersky Protection extension is designed to work together with the following Kaspersky applications: Kaspersky Anti-Virus, Kaspersky Internet Security, Kaspersky Total Security, Kaspersky Security Cloud — Free, Kaspersky Security Cloud — Personal, Kaspersky Security Cloud — Family, Kaspersky Small Office Security, Kaspersky Free, Kaspersky Basic, Kaspersky Standard, Kaspersky Plus, and Kaspersky Premium. Go to https://www.kaspersky.com/downloads and install the application.

Risk Assessment

Analyzed

100

out of 100

CRITICAL

302 security findings detected across all analyzers

Firefox extension requesting 13 permissions

Severity Breakdown

Critical

146

High

156

Medium

Low

Info

Finding Categories

146

Malware Signatures

Obfuscation

142

IoC Indicators

YARA Rules Matched

9 rules(146 hits)

postinstall crypto operations postinstall persistence mechanism postinstall network communication postinstall obfuscation postinstall file manipulation postinstall system command NoUseWeakRandom postinstall file download postinstall environment access

Requested Permissions

13 permissions

nativeMessaging

Exchange messages with programs outside the browser

Dangerous

<all_urls>

Access and modify data on every website you visit

Dangerous

http://*/*

Dangerous

https://*/*

Dangerous

Read and modify cookies on all sites

High

webRequest

Intercept, modify, and block all network requests

High

webRequestBlocking

Block network requests before they complete

High

tabs

Medium

webNavigation

Low

contextMenus

Low

storage

Low

http://www.bing.com/*

Low

https://www.bing.com/*

Low

About This Extension

The extension helps you manage protection without distracting you from what you're doing. It lets you access the protection management features right in your browser window. The set of features the extension helps you with depends on your subscription plan. Safe Money protects your data from interception when you make online payments. In some cases, the extension speeds up and enhances its work. Private Browsing informs you when websites are collecting your data and lets you restrict them if you want. It's much easier and faster from the extension menu. Anti-Banner blocks annoying pop-up ads on websites. With the extension turned on, it can detect and block even more banner types. Safe Browsing prevents you from visiting dangerous websites. Empowered with the extension, it notifies you of its work in a more convenient and timely manner in some cases. The Kaspersky Protection extension is designed to work together with the following Kaspersky applications: Kaspersky Anti-Virus, Kaspersky Internet Security, Kaspersky Total Security, Kaspersky Security Cloud — Free, Kaspersky Security Cloud — Personal, Kaspersky Security Cloud — Family, Kaspersky Small Office Security, Kaspersky Free, Kaspersky Basic, Kaspersky Standard, Kaspersky Plus, and Kaspersky Premium. Go to <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/202c6369c7b10d277edeee4db8ce00ffa082e7c6854b31f800f4e6368f7a7426/https%3A//www.kaspersky.com/downloads" rel="nofollow">https://www.kaspersky.com/downloads</a> and install the application.

Detailed Findings

160 total

YARA Rule Matches

9 rules

Indicators of Compromise

Network indicators, suspicious strings, and potential IoCs extracted during analysis

URLs

IP Addresses

Domains

128

Strings

142

All Indicators · 142

Domain

detected Domain: balloon.style.top

XIOC detected Domain: balloon.style.top

extracted_from_files

Domain

detected Domain: tab.id

XIOC detected Domain: tab.id

extracted_from_files

Domain

detected Domain: button.click

XIOC detected Domain: button.click

extracted_from_files

Domain

detected Domain: nodefilter.show

XIOC detected Domain: nodefilter.show

extracted_from_files

Domain

detected Domain: message.style

XIOC detected Domain: message.style

extracted_from_files

Domain

detected Domain: task.style

XIOC detected Domain: task.style

extracted_from_files

Domain

detected Domain: task.id

XIOC detected Domain: task.id

extracted_from_files

URL

detected URL: https://github.com/gorhill/uBlock

XIOC detected URL: https://github.com/gorhill/uBlock

extracted_from_files

Domain

detected Domain: foo.com

XIOC detected Domain: foo.com

extracted_from_files

Domain

detected Domain: avns.userconsentwindow.show

XIOC detected Domain: avns.userconsentwindow.show

extracted_from_files

URL

detected Domain: url.host

XIOC detected Domain: url.host

extracted_from_files

Domain

detected Domain: hasownproperty.call

XIOC detected Domain: hasownproperty.call

extracted_from_files

Domain

detected Domain: task.name

XIOC detected Domain: task.name

extracted_from_files

Domain

detected Domain: currentpos.top

XIOC detected Domain: currentpos.top

extracted_from_files

Domain

detected Domain: rect.top

XIOC detected Domain: rect.top

extracted_from_files

Domain

detected Domain: box.top

XIOC detected Domain: box.top

extracted_from_files

detected Domain: tooltip.show

XIOC detected Domain: tooltip.show

extracted_from_files

Domain

detected Domain: icon.show

XIOC detected Domain: icon.show

extracted_from_files

Domain

detected Domain: github.com

XIOC detected Domain: github.com

extracted_from_files

Domain

detected Domain: fsf.org

XIOC detected Domain: fsf.org

extracted_from_files

Domain

detected Domain: val.ch

XIOC detected Domain: val.ch

extracted_from_files

Domain

detected Domain: pc.download

XIOC detected Domain: pc.download

extracted_from_files

Domain

detected Domain: inputposition.top

XIOC detected Domain: inputposition.top

extracted_from_files

Domain

detected Domain: icon.name

XIOC detected Domain: icon.name

extracted_from_files

Domain

detected Domain: iconelement.name

XIOC detected Domain: iconelement.name

extracted_from_files

Domain

detected Domain: avns.objecthasownproperty.call

XIOC detected Domain: avns.objecthasownproperty.call

extracted_from_files

Domain

detected Domain: prevpos.top

XIOC detected Domain: prevpos.top

extracted_from_files

Domain

detected Domain: r.top

XIOC detected Domain: r.top

extracted_from_files

Domain

detected Domain: evt.target

XIOC detected Domain: evt.target

extracted_from_files

Domain

detected Domain: frameinfo.coord.top

XIOC detected Domain: frameinfo.coord.top

extracted_from_files

Domain

detected Domain: obj.top

XIOC detected Domain: obj.top

extracted_from_files

Domain

detected Domain: object.prototype.hasownproperty.call

XIOC detected Domain: object.prototype.hasownproperty.call

extracted_from_files

Domain

detected Domain: this.ch

XIOC detected Domain: this.ch

extracted_from_files

Domain

detected Domain: info.ch

XIOC detected Domain: info.ch

extracted_from_files

Domain

detected Domain: accountelement.id

XIOC detected Domain: accountelement.id

extracted_from_files

Domain

detected Domain: arg.target

XIOC detected Domain: arg.target

extracted_from_files

Domain

detected Domain: 7571494ce0b94e11bb762b659a4ad71f.kaspersky.com.host

XIOC detected Domain: 7571494ce0b94e11bb762b659a4ad71f.kaspersky.com.host

extracted_from_files

Domain

detected Domain: func.call

XIOC detected Domain: func.call

extracted_from_files

Domain

detected Domain: sizedata.style

XIOC detected Domain: sizedata.style

extracted_from_files

Domain

detected Domain: elementrect.top

XIOC detected Domain: elementrect.top

extracted_from_files

Domain

detected Domain: scroll.top

XIOC detected Domain: scroll.top

extracted_from_files

Domain

detected Domain: oldclearinterval.call

XIOC detected Domain: oldclearinterval.call

extracted_from_files

Domain

detected Domain: ns.documentcreatetextnode.call

XIOC detected Domain: ns.documentcreatetextnode.call

extracted_from_files

Domain

detected Domain: originaltoisostring.call

XIOC detected Domain: originaltoisostring.call

extracted_from_files

Domain

detected Domain: originalgettime.call

XIOC detected Domain: originalgettime.call

extracted_from_files

Domain

detected Domain: originalbtoa.call

XIOC detected Domain: originalbtoa.call

extracted_from_files

Domain

detected Domain: window.top

XIOC detected Domain: window.top

extracted_from_files

Domain

detected Domain: event.target

XIOC detected Domain: event.target

extracted_from_files

Domain

detected Domain: document.location.host

XIOC detected Domain: document.location.host

extracted_from_files

Domain

detected Domain: originaldocumentcreateelement.call

XIOC detected Domain: originaldocumentcreateelement.call

extracted_from_files

Domain

detected Domain: www.gnu.org

XIOC detected Domain: www.gnu.org

extracted_from_files

URL

detected URL: http://addons.mozilla.org/ca/crl.pem0N

XIOC detected URL: http://addons.mozilla.org/ca/crl.pem0N

extracted_from_files

Domain

detected Domain: www.bing.com

XIOC detected Domain: www.bing.com

extracted_from_files

Domain

detected Domain: oldcleartimeout.call

XIOC detected Domain: oldcleartimeout.call

extracted_from_files

Domain

detected Domain: oldsetinterval.call

XIOC detected Domain: oldsetinterval.call

extracted_from_files

Domain

detected Domain: message.data

XIOC detected Domain: message.data

extracted_from_files

Domain

detected Domain: vk.click

XIOC detected Domain: vk.click

extracted_from_files

Domain

detected Domain: balloon.show

XIOC detected Domain: balloon.show

extracted_from_files

Domain

detected Domain: mac.show

XIOC detected Domain: mac.show

extracted_from_files

Domain

detected Domain: submitelement.click

XIOC detected Domain: submitelement.click

extracted_from_files

Domain

detected Domain: window.xmlhttprequest.prototype.open

XIOC detected Domain: window.xmlhttprequest.prototype.open

extracted_from_files

Domain

detected Domain: originalcreatetreewalker.call

XIOC detected Domain: originalcreatetreewalker.call

extracted_from_files

Domain

detected Domain: initstyledatapair.style

XIOC detected Domain: initstyledatapair.style

extracted_from_files

Domain

detected Domain: datatoframe.data

XIOC detected Domain: datatoframe.data

extracted_from_files

Domain

detected Domain: initstyledatapair.data

XIOC detected Domain: initstyledatapair.data

extracted_from_files

URL

detected Domain: resourceurl.search

XIOC detected Domain: resourceurl.search

extracted_from_files

URL

detected Domain: porturl.search

XIOC detected Domain: porturl.search

extracted_from_files

Domain

detected Domain: sizemessage.style

XIOC detected Domain: sizemessage.style

extracted_from_files

Domain

detected Domain: this.show

XIOC detected Domain: this.show

extracted_from_files

Domain

detected Domain: ns.stringreplace.call

XIOC detected Domain: ns.stringreplace.call

extracted_from_files

Domain

detected Domain: rule.style

XIOC detected Domain: rule.style

extracted_from_files

Domain

detected Domain: window.id

XIOC detected Domain: window.id

extracted_from_files

Domain

detected Domain: target.id

XIOC detected Domain: target.id

extracted_from_files

Domain

detected Domain: ns.elementsetattribute.call

XIOC detected Domain: ns.elementsetattribute.call

extracted_from_files

Domain

detected Domain: ns.elementattachshadow.call

XIOC detected Domain: ns.elementattachshadow.call

extracted_from_files

Domain

detected Domain: datatoframe.style

XIOC detected Domain: datatoframe.style

extracted_from_files

Domain

detected Domain: this.ping

XIOC detected Domain: this.ping

extracted_from_files

Domain

detected Domain: request.report

XIOC detected Domain: request.report

extracted_from_files

Domain

detected Domain: bwfbwindow.open

XIOC detected Domain: bwfbwindow.open

extracted_from_files

Domain

detected Domain: phfbwindow.open

XIOC detected Domain: phfbwindow.open

extracted_from_files

Domain

detected Domain: popup.open

XIOC detected Domain: popup.open

extracted_from_files

Domain

detected Domain: r2.top-r1.top

XIOC detected Domain: r2.top-r1.top

extracted_from_files

Domain

detected Domain: queryparts.parts

XIOC detected Domain: queryparts.parts

extracted_from_files

Domain

detected Domain: bitmap.data

XIOC detected Domain: bitmap.data

extracted_from_files

Domain

detected Domain: this.call

XIOC detected Domain: this.call

extracted_from_files

Domain

detected Domain: nativemessagingtransport.ping

XIOC detected Domain: nativemessagingtransport.ping

extracted_from_files

Domain

detected Domain: port.id

XIOC detected Domain: port.id

extracted_from_files

Domain

detected Domain: port.name

XIOC detected Domain: port.name

extracted_from_files

Domain

detected Domain: port.sender.tab.id

XIOC detected Domain: port.sender.tab.id

extracted_from_files

Domain

detected Domain: secureinputport.id

XIOC detected Domain: secureinputport.id

extracted_from_files

Domain

detected Domain: window.open

XIOC detected Domain: window.open

extracted_from_files

Domain

detected Domain: avns.viewmode.free

XIOC detected Domain: avns.viewmode.free

extracted_from_files

Domain

detected Domain: ns.stringsplit.call

XIOC detected Domain: ns.stringsplit.call

extracted_from_files

Domain

detected Domain: caller.call

XIOC detected Domain: caller.call

extracted_from_files

Domain

detected Domain: resultarray.map

XIOC detected Domain: resultarray.map

extracted_from_files

Domain

detected Domain: options.name

XIOC detected Domain: options.name

extracted_from_files

Domain

detected Domain: oldsettimeout.call

XIOC detected Domain: oldsettimeout.call

extracted_from_files

Domain

detected Domain: originaldocumentqueryselectorall.call

XIOC detected Domain: originaldocumentqueryselectorall.call

extracted_from_files

Domain

detected Domain: originalelementqueryselectorall.call

XIOC detected Domain: originalelementqueryselectorall.call

extracted_from_files

Domain

detected Domain: chrome.runtime.id

XIOC detected Domain: chrome.runtime.id

extracted_from_files

Domain

detected Domain: windowinfo.id

XIOC detected Domain: windowinfo.id

extracted_from_files

Domain

detected Domain: ns.objecthasownproperty.call

XIOC detected Domain: ns.objecthasownproperty.call

extracted_from_files

Domain

detected Domain: this.open

XIOC detected Domain: this.open

extracted_from_files

Domain

detected Domain: date.now

XIOC detected Domain: date.now

extracted_from_files

Domain

detected Domain: chrome.management

XIOC detected Domain: chrome.management

extracted_from_files

Domain

detected Domain: chrome.storage

XIOC detected Domain: chrome.storage

extracted_from_files

Domain

detected Domain: plugin.name

XIOC detected Domain: plugin.name

extracted_from_files

Domain

detected Domain: ns.md

XIOC detected Domain: ns.md

extracted_from_files

Domain

detected Domain: balloon.id

XIOC detected Domain: balloon.id

extracted_from_files

Domain

detected Domain: sender.tab

XIOC detected Domain: sender.tab

extracted_from_files

Domain

detected Domain: sender.tab.id

XIOC detected Domain: sender.tab.id

extracted_from_files

Domain

detected Domain: createproperties.id

XIOC detected Domain: createproperties.id

extracted_from_files

URL

detected Domain: parenturl.host

XIOC detected Domain: parenturl.host

extracted_from_files

URL

detected Domain: targeturl.host

XIOC detected Domain: targeturl.host

extracted_from_files

Domain

detected Domain: sender.id

XIOC detected Domain: sender.id

extracted_from_files

Domain

detected Domain: browsersapi.runtime.id

XIOC detected Domain: browsersapi.runtime.id

extracted_from_files

Domain

detected Domain: ncurrent.id

XIOC detected Domain: ncurrent.id

extracted_from_files

Domain

detected Domain: cookie.name

XIOC detected Domain: cookie.name

extracted_from_files

detected IP: 2.14.56.9

XIOC detected IP: 2.14.56.9

extracted_from_files

Domain

detected Domain: signingca1.addons.mozilla.org

XIOC detected Domain: signingca1.addons.mozilla.org

extracted_from_files

Domain

detected Domain: mozilla.com

XIOC detected Domain: mozilla.com

extracted_from_files

Domain

detected Domain: addons.mozilla.org

XIOC detected Domain: addons.mozilla.org

extracted_from_files

Domain

detected Domain: content-signature.mozilla.org

XIOC detected Domain: content-signature.mozilla.org

extracted_from_files

Domain

detected Domain: kaspersky.com

XIOC detected Domain: kaspersky.com

extracted_from_files

Domain

detected Domain: t6ff6f34b95b903513c8c3dd1629d4be3.d6b58d296471be54c67d6025e9581dbd.addons.mozilla.org

XIOC detected Domain: t6ff6f34b95b903513c8c3dd1629d4be3.d6b58d296471be54c67d6025e9581dbd.addons.mozilla.org

extracted_from_files

Other

detected Email: [email protected]

XIOC detected Email: [email protected]

extracted_from_files

Other

detected Email: [email protected]

XIOC detected Email: [email protected]

extracted_from_files

Domain

detected Domain: element.id

XIOC detected Domain: element.id

extracted_from_files

Domain

detected Domain: data.report

XIOC detected Domain: data.report

extracted_from_files

Domain

detected Domain: policelink.target

XIOC detected Domain: policelink.target

extracted_from_files

URL

detected URL: https://addons.mozilla.org/firefox/addon/kaspersky-protection-2021/privacy/

XIOC detected URL: https://addons.mozilla.org/firefox/addon/kaspersky-protection-2021/privacy/

extracted_from_files

URL

detected URL: http://foo.com

XIOC detected URL: http://foo.com

extracted_from_files

URL

detected URL: https://www.bing.com/*

XIOC detected URL: https://www.bing.com/*

extracted_from_files

URL

detected URL: http://www.bing.com/*

XIOC detected URL: http://www.bing.com/*

extracted_from_files

URL

detected URL: http://www.gnu.org/philosophy/why-not-lgpl.html

XIOC detected URL: http://www.gnu.org/philosophy/why-not-lgpl.html

extracted_from_files

URL

detected URL: http://www.gnu.org/licenses/

XIOC detected URL: http://www.gnu.org/licenses/

extracted_from_files

URL

detected URL: http://fsf.org/

XIOC detected URL: http://fsf.org/

extracted_from_files

Hash

detected MD5 Hash: d6b58d296471be54c67d6025e9581dbd

XIOC detected MD5 Hash: d6b58d296471be54c67d6025e9581dbd

extracted_from_files

detected IP: ::

XIOC detected IP: ::

extracted_from_files

Domain

detected Domain: chrome.windows

XIOC detected Domain: chrome.windows

extracted_from_files

Domain

detected Domain: header.name

XIOC detected Domain: header.name

extracted_from_files

Domain

detected Domain: protectiondisabledbanner.show

XIOC detected Domain: protectiondisabledbanner.show

extracted_from_files

Security Analysis Summary

Security Analysis Overview

Kaspersky Protection 2021 is a Firefox Add-ons extension published by Kaspersky. Version 2.14.56.9 has been analyzed by the Risky Plugins security platform, receiving a risk score of 100/100 (CRITICAL risk) based on 302 security findings.

Risk Assessment

This extension presents critical security risk. Severe issues were detected, potentially including malware indicators, exposed secrets, or dangerous behaviors. Installation is strongly discouraged until these issues are addressed.

Findings Breakdown

High: 146 finding(s)
Medium: 156 finding(s)

What Was Analyzed

The security assessment covers multiple analysis categories:

Malware Detection: YARA rule matching against 2,400+ malware signatures
Secret Detection: Scanning for exposed API keys, tokens, and credentials
Static Analysis: Code-level security analysis for common vulnerability patterns
Network Analysis: Detection of suspicious network communications and endpoints
Obfuscation Detection: Identification of code obfuscation techniques

Developer Information

Kaspersky Protection 2021 is published by Kaspersky on the Firefox Add-ons marketplace. The extension has approximately 333K users.

Recommendation

This extension is not recommended for installation without thorough manual review. Consider alternatives with lower risk scores, or contact the developer to address the identified security concerns.

Source Code Viewer

Source Code Not Available

Source code is not available for this version of the extension.

Frequently Asked Questions

Similar Extensions

Related extensions from the same publisher or marketplace

Kaspersky Protection 2021

Kaspersky

CRITICAL 356K users

Tailfeather

dragongirlsnout

CRITICAL 5 users

AdBlock Ninja for Firefox

AdBlock Ninja

CRITICAL 59 users

Foxhole for Claude

DrBenedictPorkins

CRITICAL 28 users

DM Developer

Jimmy Pautz

CRITICAL 6 users

FullScreenie: Screenshot, Annotate & Share

thebug

CRITICAL 19 users

Risk Assessment

Severity Breakdown

Finding Categories

YARA Rules Matched

Requested Permissions

About This Extension

Detailed Findings

OBFUSCATION-LARGE_BASE64-snapshot_resources/vk/browser_keyboard_layouts.js-4

OBFUSCATION-FUNCTION_INDIRECT-content/virtual_keyboard_content.js-226

OBFUSCATION-LARGE_BASE64-snapshot_resources/vk/browser_keyboard_layouts.js-369

OBFUSCATION-LARGE_BASE64-snapshot_resources/vk/browser_keyboard_layouts.js-478

OBFUSCATION-LARGE_BASE64-snapshot_resources/vk/browser_keyboard_layouts.js-569

MANIFEST-SENSITIVE-PERM-<ALL_URLS>

MANIFEST-SENSITIVE-PERM-NATIVEMESSAGING

MANIFEST-SENSITIVE-PERM-TABS

OBFUSCATION-LARGE_BASE64-snapshot_resources/vk/browser_keyboard_layouts.js-96

OBFUSCATION-LARGE_BASE64-snapshot_resources/vk/browser_keyboard_layouts.js-434

OBFUSCATION-LARGE_BASE64-snapshot_resources/vk/browser_keyboard_layouts.js-187

OBFUSCATION-LARGE_BASE64-snapshot_resources/vk/browser_keyboard_layouts.js-278

OBFUSCATION-LARGE_BASE64-snapshot_resources/vk/browser_keyboard_layouts.js-50

OBFUSCATION-LARGE_BASE64-snapshot_resources/vk/browser_keyboard_layouts.js-524

YARA Rule Matches

postinstall crypto operations

postinstall persistence mechanism

postinstall network communication

postinstall obfuscation

postinstall file manipulation

postinstall system command

NoUseWeakRandom

postinstall file download

postinstall environment access

Indicators of Compromise

All Indicators · 142

Security Analysis Summary

Security Analysis Overview

Risk Assessment

Findings Breakdown

What Was Analyzed

Developer Information

Recommendation

Frequently Asked Questions

Similar Extensions

Kaspersky Protection 2021

Tailfeather

AdBlock Ninja for Firefox

Foxhole for Claude

DM Developer

FullScreenie: Screenshot, Annotate & Share