Other good FFox uses: Tidy - (x)html compliancy, (x)html validity. Color Picker - Get the hex value of any pixel in your browser from the current page. YSlow - See why the page takes so long to load. Browser Timer - catalog how much time you spend both online in general and at each site. No Squint - set font sizes on a site by site basis, so hard to read sites are no more. webmaster toolbar - allows tweaking of values on some sites (including hidden input variables which can be fun) XRay - see in-line the html values of a page as they occour
Hundreds/thousands of useful addons (and millions of crappy ones)
