Firefox
A list of website speed optimisation tools/add-ons/plugins for the Firefox web-browser.
FireBug
FireBug is the classic web developers site analysis tool.
Page Speed
Google’s Firefox/FireBug plugin that adds an extra tab into FireBug allowing you to access advanced page speed information and tips.
YSlow
Yahoo’s FireBug add-on that provides advanced tips for high performance websites.
lori (Life-of-request info)
Lori provides various load time stats straight into the Firefox status-bar.
Hammerhead
Hammerhead shows web page load-time in the Firefox status-bar.