Perform Web Vitals Test & TTFB Test on Multiple Locations & Devices. SpeedVitals Extension helps measure the performance of a website directly from that website itself.

SpeedVitals promo image
What is SpeedVitals?

SpeedVitals is a free Firefox add-on that uses Lighthouse and Chrome's User Experience API to measure web performance. It provides insights on Web Vitals, TTFB, multi-device testing, multi-location testing, field data, resource graphs, waterfall charts, layout shift visualization, code coverage, and speed optimization tips.

Users: 350 ▼ -1
Rating: 2.33 (3)
Version: 2.4.1 (Last updated: 2023-06-28)
Creation date: 2021-10-15
Weekly download count: 18
Firefox on Android: No
Risk impact: Low risk impact
Risk likelihood: Moderate risk likelihood
Manifest version: 2
  • activeTab
  • storage
  • cookies
  • https://*.speedvitals.com/
  • https://*.speedvitals-dev.com/
Size: 47.36K
Stats date:

Other platforms

Not available on Chrome
Not available on Edge
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SpeedVitals is a free Web Performance measurement tool that uses Lighthouse to measure Lab Data and Chrome's User Experience API (CrUX) to measure field data.

Key Features

  1. Web Vitals: Measure all the Web Vitals such as First Contentful Paint (FCP), Largest Contentful Paint (LCP), Cumulative Layout Shift (CLS), First Contentful Paint (FCP), Time to Interactive (TTI), and Speed Index (SI). We also measure some other metrics like Server Response Time (TTFB) and Web Page Size.

  2. TTFB Testing: Measure TTFB (Time to First Byte) from 40 locations across the globe

  3. Multi-Device Testing: Measure your Website's Performance across more than 30 devices having different Form Factors

  4. Multi-Location Testing: Run Core Web Vitals test on more than 35 locations across the globe including United States, United Kingdom, India, Japan, Australia, Germany, Brazil, South Korea, and more.

  5. Field Data: View the real-world Core Web Vitals data of any Web Page using Chrome's User Experience API.

  6. Resource Graphs: Resource Graphs give a visual representation of Web Page resource distribution.

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Risk impact

SpeedVitals is relatively safe to use as it requires very minimum permissions.

Risk likelihood

SpeedVitals is probably trust-worthy. Prefer other publishers if available. Exercise caution when installing this add-on.

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