Top Risks

• THREAT FEED: extension ID independently confirmed malicious by TPCI chrome-mal-ids — Kuromi With Friends Wallpaper [adware] + malext.io malicious_extension_sentry (+2.5, capped).
• NewTab override + search permission: every new tab monetized via gameograf.com ecosystem.
• Privacy policy points to Google's own policy — not scoped to this extension; admits data collection & 3rd-party sharing.
• Uninstall and install URL hijacks redirect to gameograf.com with UTM tracking parameters.
• No CSP declared (MV3 default helps but DOM-XSS innerHTML sink in popup.js is unmitigated.

Evidence

• newtab_override manifest chrome_url_overrides.newtab = newtab.html — replaces every new tab page.
• uninstall_url_hijack crx setUninstallURL → https://gameograf.com/?utm_source=gameograf&utm_medium=link&utm_campaign=bg&utm_content=uninstall
• install_url_hijack crx onInstalled opens https://gameograf.com/?utm_source=install&utm_medium=link&utm_campaign=bg&utm_content=install
• privacy_policy_generic api Policy URL is Google's own account privacy page; scope_extension=false, data_collection=true, third_party_sharing=true.
• dom_xss_sink crx innerHTML assigned from variable in js/popup.js; no CSP to mitigate.
• stale_extension store 15 months since last update; verified-publisher discount capped at -1.0 per v3.5 rule 0c (stale >18mo threshold not met but >12mo Maintenance penalty applies).
• no_developer_name store developer_name is empty string; reduces accountability.
• newtab_monetization_shape manifest NewTab + search override + install/uninstall UTM hooks = classic traffic-monetization shell pattern.
• threat_feed_membership api Extension ID listed by TPCI chrome-mal-ids — Kuromi With Friends Wallpaper [adware] + malext.io malicious_extension_sentry; score 5.49 -> 7.99 (+2.5 cap 2.5).

Permissions Breakdown

• search medium Can alter search provider behaviour; paired with newtab override raises monetization concern.
• host_permissions: https://api.gameograf.com/* low Scoped to own API domain; limited blast radius.
• chrome_url_overrides: newtab medium Replaces every new tab; high reach, monetization surface.

Pillar Scores

Bookkeeping