Antivirus Firefox add-ons

Antivirus, anti-malware and phishing protection. 174 live add-ons carry the topic.

Tags come from each listing's name, category and description, read in English: a listing written in another language is tagged only where it uses the English words.

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  1. 360 Internet Protection↗

    by 360 Total Security · updated 2026-08-17

    This extension is web threat protection of 360 Total Security for Firefox. It identifies malicious URL in real-time and blocks web threats. The capabilities of anti-fraud, anti-phishing and anti-mali

    Privacy & Security v5.0.0.1037
    Daily users 43,651 +501 wk
    Rating 4.5 2,311 ratings
    Growth · week +501 +1.2%

  2. Port Authority↗

    by Hacks and Hops · updated 2025-06-30

    Blocks malicious websites from port-scanning your computer/network and dynamically blocks all LexisNexis endpoints from running their invasive data collection scripts.

    Web Development ★ Featured v2.2.0
    Daily users 28,411 +240 wk
    Rating 4.6 83 ratings
    Growth · week +240 +0.9%

  3. Sheed Internet Security Plugin↗

    by SheedSoft · updated 2025-11-15

    Sheed Internet Security is a Microsoft Windows (R) software which protects PC. This extension allows Sheed Internet Security's integration with browser for scanning of URLs for malware and also checki

    Privacy & Security v3.5.4.340
    Daily users 3,992 +172 wk
    Rating 4.5 27 ratings
    Growth · week +172 +4.5%

  4. K7 WebProtection↗

    by K7 Computing · updated 2026-02-11

    Protect yourself from malicious websites and experience safe browsing

    Other v7.0
    Daily users 1,768 +68 wk
    Rating 4.3 150 ratings
    Growth · week +68 +4.0%

  5. Adaware AdBlock↗

    by Adaware · updated 2023-06-26

    By blocking annoying ads and nosy trackers, Adaware AdBlock nearly doubles your browsing speed! And with the most robust antivirus-level cloud-scanning technology of any ad blocker on the market, you’

    Privacy & Security v3.0.0
    Daily users 8,658 +49 wk
    Rating 3.9 69 ratings
    Growth · week +49 weekly avg over 12 days

  6. Dr.Web LinkChecker↗

    by Doctor Web Anti-Virus · updated 2022-12-08

    This plugin allows you to check any file you are about to download, any page you are about to visit with online version of Dr.Web anti-virus.

    Privacy & Security v3.9.22.11161
    Daily users 2,453 +6 wk
    Rating 4.1 42 ratings
    Growth · week +6 +0.2%

  7. Porn/Malware Blocker↗

    by haydentech · updated 2024-04-25

    Blocks known pornographic and malware domains. When attempting to go to such a domain, the user is redirected to another page, alerting them that the site has been blocked. Unlike other extensions,

    Privacy & Security v1.5resigned1
    Daily users 2,638 +4 wk
    Rating 4.0 101 ratings
    Growth · week +4 +0.2%

  8. Pixm Phishing Protection↗

    by Chris Cleveland · updated 2026-08-27

    Stop phishing attempts at the point of click

    Privacy & Security v0.1.1.0
    Daily users 1,288 -165 wk
    Rating 3.0 2 ratings
    Growth · week -165 -11.3%

    Unrated listings show no rating rather than zero — the store renders 0 out of 5 for never-rated items, and storing that as 0.0 would drag every category average down. Blank install counts are equally real: themes never show a count, and many small extensions don't either. Delisted listings are excluded from these views but retained in the database.