YSlow 2.1.0 Page Analysis Tool Releases with Bug Fixes; Now Compatible with Firefox 3.6 and Firefox 4 Beta

Written By Sam on 21 October 2010
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Yahoo has released the latest version of its Firebug extension ‘YSlow’. The YSlow 2.1.0 version reportedly comes with major bug fixes. For the uninitiated, YSlow is a Firefox add-on integrated with the Firebug web development tool. It is a page analysis tool aimed at enabling users to optimize their web pages and improve their performance.

Here’s a summary of the bugs fixed as revealed in the Yahoo Developer Network:

  • Compatible with Firefox 3.6, as well as Firefox 4 Beta.
  • Compatible with Firebug 1.6 beta
  • Updated JSLint version
  • Improved error message display (removed pop-up, using console instead for error message)
  • Fixed certain infinite loops issues for redirects and some autorun weird behavior.
  • Added new rule for detecting empty src or href (<img src=”>, <link href=””>, and <script src=””>).
  • Added logic to not consider deferred scripts on head as offenders — previous version of YSlow complains when scripts tags are inserted dynamically into the HEAD tag. Such scripts do not block page rendering and are downloaded in parallel with other resources.
  • Fixed inconsistency in displaying Expires date inside YSlow report
  • Summary View column
  • Fixed ‘JavaScript at bottom rule’ issue — previous version of YSlow complains when scripts tags are inserted dynamically into the HEAD tag, now it doesn’t consider dynamically injected scripts into HEAD
  • Fixed issue running JSLint from a page loaded from a previous about:blank.

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