As this screenshot shows, I only use a handful of add-ons at a time. These buttons allow me to clear the DNS/Cookies/Cache for whichever site I’m on when I click it. Very very helpful for me as a web designer. The 4th button there is just a restart button. Other than those, Firebug, YSlow, LastPass, and Web Developer are the only ones I always use regularly.
I like the idea of the last.fm but it’s not as powerful as the site, which is awesome. Lately listening to Kings of Leon Radio…
By removing the ETag header, you disable caches and browsers from being able to validate files, so they are forced to rely on your Cache-Control and Expires header.
A first-time visitor to your page will make several HTTP requests to download all your sites files, but using the Expires header you make those files cacheable. This avoids unnecessary HTTP requests on subsequent page views.
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