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YSlow for Firefox 3.5 Rated 5 out of 5 stars
To run YSlow 2.0.0b3 in Mozilla Firefox 3.5, you just need to unzip the xpi file and modify install.rdf to:
you can download the Firefox 3.5 version here: http://rapidshare.com/files/252621630/yslow-2.0.0b3-fx-3.5.xpi