Page Performance Score
Show Core Web Vitals for any page on demand.
dev
PlugThis prompt
Build a Chrome extension called "Page Performance Score" that, on demand from the popup, measures Core Web Vitals on the current page using the web-vitals library injected into the page context: LCP, INP, CLS, FCP, TTFB. Show each metric with the threshold (good/needs-improvement/poor) and a sparkline of the last 10 visits to that origin. Provide a "Run Lighthouse-lite audit" button for layout/perf hints. Permissions: storage, activeTab, scripting. Manifest V3.
How to build it in 3 minutes
- Sign in to PlugThis and open the chat input.
- Copy the prompt above and paste it into the chat.
- PlugThis generates the full Manifest V3 extension in 60-90 seconds.
- Download the zip, extract it, and load it via
chrome://extensionsdeveloper mode.