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New Firefox Addon Protects Against Malicious Spam SEO

ID: 74aaaa68-ca8f-5e0c-86c3-95bd7257ccb3

STIX ID: report--74aaaa68-ca8f-5e0c-86c3-95bd7257ccb3

Feed Name: Zscaler Security Research Blog

Date Published: 2025-04-02

Date Updated: 2026-05-01

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The report describes the 'Search Engine Security' Firefox add-on which protects users from spam-SEO attacks (fake antivirus and fake video pages) by altering the Referer header — and optionally the User-Agent — on requests originating from Google, Bing, and Yahoo so malicious pages cannot detect search-engine referrals and deliver malware or scam content; it includes configuration options, an allowlist, and on-page notifications.

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