How to enable YSlow in Firefox?

I have installed the latest versions of YSlow and Firebug into the latest version of Firefox on Windows 7 (and restarted Firefox), but when I click on YSlow nothing happens. Also, when I click on Firebug, it opens but has no YSlow tab. I have disabled all other Firefox plugins and played with right-clicking YSlow and clicking run once and auto-run.

What am I doing wrong?

How do you use YSlow?

YSlow works by crawling your website and comparing it against a list of 23 rules, based on Yahoo's rules for high-performance websites. YSlow then scores your site against these 23 rules and gives you an overall score based on the average. Each of the 23 rules has a different weighting.

How to install YSlow in chrome?

Visit http://yslow.org to install the YSlow extension on your web browser. On Google Chrome, YSlow runs independently. On Mozilla Firefox, however, you must also install the Firebug add-on to use YSlow. When you first start the YSlow plugin, the Home tab is selected.

As a temporary solution, try using the YSlow bookmarklet.

It's an equivalent of regular YSlow.