Report Summary

  • 66

    Performance

    Renders faster than
    79% of other websites

  • 97

    Accessibility

    Visual factors better than
    that of 94% of websites

  • 92

    Best Practices

    More advanced features
    available than in
    86% of websites

  • 92

    SEO

    Google-friendlier than
    79% of websites

mozdev.org

Internet for people, not profit — Mozilla

Page Load Speed

1.6 sec in total

First Response

466 ms

Resources Loaded

480 ms

Page Rendered

618 ms

mozdev.org screenshot

About Website

Click here to check amazing Mozdev content for United States. Otherwise, check out these important facts you probably never knew about mozdev.org

Mozilla is the not-for-profit behind the lightning fast Firefox browser. We put people over profit to give everyone more power online.

Visit mozdev.org

Key Findings

We analyzed Mozdev.org page load time and found that the first response time was 466 ms and then it took 1.1 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 15% of websites can load faster. This domain responded with an error, which can significantly jeopardize Mozdev.org rating and web reputation

Performance Metrics

mozdev.org performance score

66

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value2.9 s

52/100

10%

LCP (Largest Contentful Paint)

Value2.9 s

79/100

25%

SI (Speed Index)

Value4.3 s

75/100

10%

TBT (Total Blocking Time)

Value430 ms

64/100

30%

CLS (Cumulative Layout Shift)

Value0.171

70/100

15%

TTI (Time to Interactive)

Value8.1 s

41/100

10%

Network Requests Diagram

mozdev.org

466 ms

Our browser made a total of 1 request to load all elements on the main page. We found that all of those requests were addressed to Mozdev.org and no external sources were called. The less responsive or slowest element that took the longest time to load (466 ms) belongs to the original domain Mozdev.org.

Page Optimization Overview & Recommendations

Page size can be reduced by 375.3 kB (80%)

Content Size

467.8 kB

After Optimization

92.5 kB

In fact, the total size of Mozdev.org main page is 467.8 kB. This result falls within the top 5000 of lightweight and thus fast loading web pages. Only a small number of websites need less resources to load. CSS take 381.6 kB which makes up the majority of the site volume.

HTML Optimization

-79%

Potential reduce by 444 B

  • Original 560 B
  • After minification 162 B
  • After compression 116 B

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. This page needs HTML code to be minified as it can gain 398 B, which is 71% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 444 B or 79% of the original size.

Image Optimization

-5%

Potential reduce by 2.0 kB

  • Original 38.5 kB
  • After minification 36.5 kB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Mozdev images are well optimized though.

JavaScript Optimization

-63%

Potential reduce by 29.8 kB

  • Original 47.2 kB
  • After minification 47.0 kB
  • After compression 17.5 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 29.8 kB or 63% of the original size.

CSS Optimization

-90%

Potential reduce by 343.1 kB

  • Original 381.6 kB
  • After minification 250.1 kB
  • After compression 38.5 kB

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Mozdev.org needs all CSS files to be minified and compressed as it can save up to 343.1 kB or 90% of the original size.

Requests Breakdown

We found no issues to fix!

Requests Now

0

After Optimization

0

Besides the initial HTML request, no CSS, Javascripts, AJAX or image files were requested in the course of web page rendering.

Accessibility Review

mozdev.org accessibility score

97

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Navigation

These are opportunities to improve keyboard navigation in your application.

Impact

Issue

High

Heading elements are not in a sequentially-descending order

Best Practices

mozdev.org best practices score

92

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

SEO Factors

mozdev.org SEO score

92

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Links do not have descriptive text

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    N/A

  • Encoding

    N/A

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Mozdev.org can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and neither this language nor any other was claimed in <html> or <meta> tags. Our system also found out that Mozdev.org main page’s claimed encoding is . Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

Open Graph description is not detected on the main page of Mozdev. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: