Top Risks

• Privacy policy is Google's generic policy — does not scope to this extension; admits data collection and 3rd-party sharing (+10 privacy).
• Uninstall URL hijack flagged (uninstall_url_hijack=true) and install URL hijack to cssvalidator.app/welcome — monetization/tracking risk.
• No developer name listed; missing 'Offered by' accountability signal.
• Extension stale 21 months (6-12mo band) with no changelog visible.
• DOM-XSS sink (innerHTML from variable) in bundled ace.js with no CSP present.

Evidence

• uninstall_url_hijack crx uninstall_url_hijack=true; install_url_hijack=true targeting https://cssvalidator.app/welcome — redirect tracking on lifecycle events.
• generic_privacy_policy store Policy URL is Google's own account policy; scope_extension=false, data_collection=true, third_party_sharing=true — generic and admits broad data sharing.
• no_developer_name store developer_name is empty; no verified publisher badge; reduced accountability.
• stale_extension store Last updated November 2024; months_since_update=21 — falls in 12-24mo band (+6.0 maintenance).
• dom_xss_sink crx innerHTML assignment from variable in lib/ace/src/ace.js; no CSP present, elevating DOM-XSS risk.
• external_hosts crx JS contacts cssvalidator.app, github.com, headlinegenerator.app — headlinegenerator.app is unrelated to CSS validation.
• no_csp crx content_security_policy is null; csp_present=false for MV3 extension with DOM-sink finding.
• install_url_hijack crx install_url_hijack=true; target https://cssvalidator.app/welcome — Webstore +2.0 per rule.

Permissions Breakdown

• storage low Local key-value store only; no cross-origin data access.

Pillar Scores

Bookkeeping