How can I see how much bandwidth my website uses?

Question

I'm looking for a Firefox addon which will track how much bandwidth a page is using. This could be a regular HTML page or GMail with the chat feature using Javascript. Is there anything that will help me optimize my page like this?

Answer 1

FireBug has function that allows you to see how much bandwidth and how long certain scripts, pages, images, etc take to load

Answer 2

Perhaps YSlow is what you're looking for?

Answer 3

1. Install Firebug
2. Download YSlow
3. Review the YSlow User Guide