Top Risks

• THREAT FEED: extension ID independently confirmed malicious by TPCI chrome-mal-ids — Nissan Silvia Live Wallpaper [adware] + malext.io malicious_extension_sentry (+2.5, capped).
• Privacy policy is Google's generic policy — does not scope to this extension; admits data collection and third-party sharing (→ Privacy +10.0).
• NewTab override replaces every new-tab page; combined with uninstall/install URL hijacks, clear monetization shell pattern.
• Uninstall and install URL hijacks redirect to gameograf.com with UTM tracking parameters.
• No CSP (csp_present==false) with innerHTML DOM-XSS sinks in popup.js and calendar.js.

Evidence

• newtab_override manifest chrome_url_overrides.newtab set to newtab.html — replaces every new-tab page for 993 users.
• install_uninstall_hijack crx Both onInstalled and onUninstalled open gameograf.com UTM URLs — monetization shell pattern (+2+3 Webstore).
• generic_privacy_policy store Privacy URL is Google's own policy (myaccount.google.com/privacypolicy); scope_extension=false, data_collection=true, third_party_sharing=true → +10.0 Privacy.
• dom_xss_no_csp crx innerHTML sinks in popup.js and calendar.js; csp_present=false elevates each from +0.5 to +2.0 per finding (FIX B).
• no_developer_name store developer_name is empty string — no 'Offered by' shown; +1.0 Reputation.
• verified_publisher store verified_publisher=true; -3.0 Reputation, but 0c cap does not apply (no staleness/CVE/monetization hits).
• newtab_monetization_pattern manifest NewTab + search permission + install/uninstall hijack = classic ad-monetization NewTab cluster.
• jquery_3_7_1 crx jQuery 3.7.1 bundled — no known CVEs at this version; cve_findings_raw empty.
• threat_feed_membership api Extension ID listed by TPCI chrome-mal-ids — Nissan Silvia Live Wallpaper [adware] + malext.io malicious_extension_sentry; score 5.21 -> 7.71 (+2.5 cap 2.5).

Permissions Breakdown

• search medium Search API allows overriding default search engine; medium risk for a NewTab extension.
• host_permissions: https://api.gameograf.com/* low Scoped to developer's own API domain; expected for a live-wallpaper service.
• chrome_url_overrides.newtab medium Replaces new tab page — high user-surface impact, monetization vector.

Pillar Scores

Bookkeeping