Checking web page efficiency

This is more a note for myself so that I can find it later. But if you ever want to see more about what's going on when your web browser pulls pages over the internet you can use a few Firefox extensions to gain a lot of insight. Key ones to use are:

• FireBug - edit, debug, and monitor CSS, HTML, and JavaScript
• Web Developer Toolbar
  • Adds a menu and a toolbar with various web developer tools.
• YSlow - Add on for FireBug that adds more reporting about how the page is performing.

There is an article at IBM Developworks that has some info about a two of those and GreaseMonkey. It's worth reading as well.