Browser Tester loads any URL in real Chrome, Safari, and Firefox browsers and reports what breaks. It catches CSP violations, JavaScript errors, broken resources, mixed content warnings, and console errors — then returns a screenshot and pass/fail verdict for each browser.
Cross-browser issues are notoriously hard to catch without actually running the browsers. This tool automates that process: test a page across all three engines at once, see if an ad blocker breaks your layout, and audit your security headers for grade-level compliance — all without leaving your AI assistant.
What you can do
- Load any URL in Chromium, WebKit (Safari engine), and Firefox simultaneously
- Capture screenshots per browser at desktop, tablet, or mobile viewports
- Get a detailed report of CSP violations, JS errors, failed network requests, and console warnings
- Test how your page behaves with ad-blocking rules active vs. disabled
- Audit security headers — CSP, HSTS, X-Frame-Options, Permissions-Policy — and get a letter grade
Who it's for
Front-end developers catching cross-browser regressions before they reach users. Security engineers auditing header configuration. QA teams automating page health checks as part of a deployment workflow.
How to use it
- Call test_page with a URL to run the cross-browser test — results include screenshots and error lists per browser
- Add test_ad_blocker for sites with ads or analytics to see what ad-blocking rules break
- Call audit_headers to get a security header grade with specific remediation recommendations
Getting started
Start with test_page — pass any URL and it will test all three browsers and return screenshots and a pass/fail verdict immediately.
