Top Risks

• THREAT FEED: extension ID independently confirmed malicious by TPCI chrome-mal-ids — YT Search Helper + malext.io malicious_extension_sentry (+2.5, capped).
• Gmail dev email (sixtythirdholding@gmail.com) with no business identity — unverified, unaccountable developer.
• Privacy policy is Google's own account policy — not scoped to this extension; data_collection and third_party_sharing both true under that policy.
• YouTube brand mention confirmed impersonation flag (confirmed_owner=false) — could mislead users about affiliation.
• External host www.ykapf.com of unknown purpose listed in js_external_hosts — unexplained third-party endpoint.

Evidence

• free_webmail_dev store Developer email sixtythirdholding@gmail.com is a Gmail address with no verified business presence.
• brand_impersonation store brand_mention.is_impersonation=true for 'youtube'; developer is not confirmed owner.
• generic_privacy_policy store Privacy URL is Google's account policy (scope_extension=false, data_collection=true, third_party_sharing=true) — v3.5 D: +10.0.
• unknown_external_host crx js_external_hosts includes www.ykapf.com — unknown domain, no threat-intel match but unexplained.
• no_csp manifest content_security_policy is null (MV3 default strict applies, no explicit CSP override needed — no MV2 penalty).
• very_low_installs store Only 8 installs and 0 ratings — minimal community validation, high uncertainty.
• no_verified_publisher store verified_publisher=false, is_featured_by_google=false — no trust signals from Google.
• clean_code_scan crx code_findings_raw empty, obfuscation_score=0.0, no CVEs — code surface appears benign.
• threat_feed_membership api Extension ID listed by TPCI chrome-mal-ids — YT Search Helper + malext.io malicious_extension_sentry; score 4.36 -> 6.86 (+2.5 cap 2.5).

Permissions Breakdown

• storage low Stores extension settings locally; no user data exfil risk on its own.
• https://www.youtube.com/* medium Host permission scoped to YouTube only; allows content script read/write on all YouTube pages.
• https://m.youtube.com/* medium Same as desktop YouTube host — mobile YouTube pages also fully accessible.

Pillar Scores

Bookkeeping