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Best FireFox Addons to Analyze Page Load Time

Best FireFox Addons to Analyze Page Load Time

Keeping track of your site page load time is essential because it effects both the user experience and the crawl rate. This post lists three most useful FireFox addons that will help you analyze web page load time as you browse:


YSlow is the official Yahoo! addon. YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high-performance web pages. When installed, it adds a tiny icon to FireFox status bar which shows the current page load time.

YSlow is now available for many newer browsers:


Google’s Page Speed

Page Speed is a Firefox add-on that performs several tests on a site’s web server configuration and front-end code. These tests are based on a set of best practices known to enhance web page performance.

Webmasters who run Page Speed on their pages get a set of scores for each page, as well as helpful suggestions on how to improve its performance.

You can also use it in the browser, which looks like this:


LORI (Life-of-Request Info)

LORI (Life-of-Request Info) is an advanced FireFox addon that adds a status bar at the bottom right corner of Firefox and displaying:

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  • TTFB: how long it took to see the first byte from a remote server (from click to first byte received).
  • TTC: how long it took to display the page (from click to complete drawing of the page)
  • Page size (number of bytes used to display the page): this value includes both bytes fetched from network and bytes fetched from the browser’s cache.
  • Number of requests: number of requests used to fetch the page’s content (images, style-sheet, javascript, etc.). Again, this value includes both network requests and cache requests.

Note: it looks like it is not compatible with current FireFox version but it is a classic tool for page load time analysis so I couldn’t help mentioning it. 


Image Credits

Featured Image: dolphfynlow via Depositphotos

Screenshots taken by Danielle Antosz 11/2016


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Ann Smarty

Brand amd Community Manager at Internet Marketing Ninjas

Ann Smarty is the blogger and community manager at Internet Marketing Ninjas. Ann's expertise in blogging and tools serve as ... [Read full bio]

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