Top Risks

• THREAT FEED: extension ID independently confirmed malicious by TPCI chrome-mal-ids — Squeak Brawl Stars [adware] + malext.io malicious_extension_sentry (+2.5, capped).
• NewTab override with uninstall/install URL hijack — classic monetization shell pattern.
• Two unguarded innerHTML DOM-XSS sinks (no CSP to mitigate); csp_present==false amplifies risk.
• No developer name listed; low install count (562) with newtab+search override is tail-attack surface.
• Uninstall URL hijack redirects to gameograf.com tracking URL — user-tracking on removal.

Evidence

• newtab_override manifest chrome_url_overrides.newtab=newtab.html; replaces new-tab page entirely.
• 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
• dom_xss_sink crx innerHTML from variable in popup.js and calendar.js; no CSP to mitigate DOM-XSS.
• no_csp manifest content_security_policy is null; csp_present==false; MV3 default applies but no explicit hardening.
• no_developer_name store developer_name is empty string; no 'Offered by' attribution visible.
• verified_publisher store verified_publisher==true, domain resolves, not throwaway — partial trust credit applied.
• low_install_newtab store Only 562 installs with newtab+search override; rating 3.7 with no red-flag reviews found.
• threat_feed_membership api Extension ID listed by TPCI chrome-mal-ids — Squeak Brawl Stars [adware] + malext.io malicious_extension_sentry; score 3.17 -> 5.67 (+2.5 cap 2.5).

Permissions Breakdown

• search medium Allows read/override of search engine; paired with newtab override raises monetization risk.
• host_permissions: https://api.gameograf.com/* low Scoped to own API domain only; limited blast radius.
• chrome_url_overrides.newtab medium Replaces new-tab page — primary monetization surface for this category.

Pillar Scores

Bookkeeping