PerfMaster

PerfMaster puts professional-grade web performance, SEO, and security analysis tools right in your browser sidebar — no account required. Whether you're a developer debugging Core Web Vitals, an SEO specialist checking meta tags, or a site owner monitoring Lighthouse scores, PerfMaster gives you instant access to the data you need without leaving the page you're working on. FREE FOR EVERYONE — 8 TOOLS, NO ACCOUNT REQUIRED Run any of these tools on any page you visit. No sign-up, no credit card, no limits beyond fair-use rate limiting: PageSpeed Insights Audit Run a full Google PageSpeed Insights audit directly from the sidebar. Get Lighthouse scores for Performance, Accessibility, Best Practices, and SEO, plus real-world Core Web Vitals data from the Chrome UX Report (CrUX). See exactly where your page stands and what needs fixing — without opening a separate tab or navigating to pagespeed.web.dev. Meta Tag Validator Check your page's title tag, meta description, Open Graph tags, and Twitter Card markup. See a live social media share preview showing exactly how your page will appear when shared on Facebook, Twitter/X, LinkedIn, and Slack. Instantly spot missing tags, truncated descriptions, and broken OG images before your content goes live. Structured Data Checker Validate your JSON-LD and Microdata markup against Schema.org specifications. Check which Google Rich Result types your structured data qualifies for — FAQ accordions, star ratings, recipe cards, product listings, and more. See errors, warnings, and missing required properties at a glance. HTTP Header Analyzer Analyze your page's HTTP response headers with a security and performance score out of 100. Check for missing security headers (Content-Security-Policy, Strict-Transport-Security, X-Frame-Options, etc.), verify caching configuration (Cache-Control, ETag, Expires), and confirm compression is enabled (gzip/brotli). Categorized findings make it easy to prioritize fixes. Broken Link Checker Scan any page for broken links, dead resources, and redirect chains. Finds broken internal links, external links returning 4xx/5xx errors, missing images, and unreachable stylesheets or scripts. Each broken link shows the HTTP status code and the anchor text, so you can fix the most impactful issues first. Redirect Checker Trace the full redirect chain for any URL. See every hop in the chain with HTTP status codes (301, 302, 307, 308), response times per hop, and the final destination URL. Instantly identify unnecessary redirect chains that slow down page loads and waste crawl budget, and catch redirect loops before they cause problems. Sitemap Validator Verify your XML sitemap exists, is well-formed, and contains valid URLs. Check each URL's HTTP status to find dead pages still listed in your sitemap. Identify missing URLs, duplicate entries, and syntax errors. Works with sitemap index files and gzipped sitemaps. AI/MCP Readiness Checker Check whether a website supports the Model Context Protocol (MCP) for AI agent compatibility. Detects .well-known/mcp.json discovery files, WebMCP declarative tool attributes on forms, and the navigator.modelContext imperative API. See if a site is ready for the next generation of AI-powered browsing. MONITOR YOUR SITES — CONNECT YOUR PERFMASTER ACCOUNT Sign in with your PerfMaster account to unlock real-time monitoring for all your tracked sites. When you visit a page that's being monitored, the extension automatically shows your latest performance data. Score Cards See your four Lighthouse category scores at a glance — Performance, Accessibility, Best Practices, and SEO. Scores are color-coded: green (90-100), yellow (50-89), red (0-49). Shows lab audit scores by default with PSI fallback. Core Web Vitals Monitor all five Core Web Vitals metrics with color-coded status indicators: LCP (Largest Contentful Paint) — Good under 2.5s, Poor over 4s INP (Interaction to Next Paint) — Good under 200ms, Poor over 500ms CLS (Cumulative Layout Shift) — Good under 0.1, Poor over 0.25 FCP (First Contentful Paint) — Good under 1.8s, Poor over 3s TTFB (Time to First Byte) — Good under 800ms, Poor over 1.8s Badge Indicator The extension icon shows your page's Lighthouse Performance score directly in the toolbar — green for 90+, yellow for 50-89, red for under 50. Know your page's health at a glance without even opening the sidebar. 8 DATA TABS — DEEP INSIGHTS FOR MONITORED PAGES Click into any of these tabs to see detailed data for the page you're viewing: Field Data — Real user metrics from the Chrome UX Report. See whether your page is passing Core Web Vitals in the real world, with per-metric breakdowns and overall CWV pass/fail status. Lab Data — Your latest Lighthouse audit results. Desktop and mobile scores for all four categories, plus detailed performance metrics. See exactly what Lighthouse flagged and track improvements over time. Google Search Console — Impressions, clicks, click-through rate, and average search position for the specific page you're viewing. See which queries are driving traffic and how your page ranks. Requires a Google connection in PerfMaster. URL Inspection — Google's URL Inspection API results. See the indexing verdict (Indexed, Partially Indexed, Not Indexed, Excluded), crawl status, robots.txt state, canonical URL (with mismatch detection), last crawl date, and referring URLs. Costs 1 credit per check. Google Analytics — Users, sessions, events, and conversions for the page from Google Analytics 4. See page-specific traffic metrics alongside your performance data. Requires a GA4 connection. Bing Webmaster — Clicks, impressions, CTR, and average position from Bing's search data. Monitor your Bing performance alongside Google data for a complete search visibility picture. Requires a Bing Webmaster Tools connection. Security Audit — Security scan results with a score out of 100. Category scores for HTTPS/TLS, Security Headers, Cookie Security, Content Security, a…