Firefox extension for total page size?

Question

Does anybody know a good Firefox extension to monitor the total page size, including all supplementary files. I know there is one that monitors the viewstate size in the bottom bar and that's invaluable as an ASP.Net developer, but I wonder it there's one that monitors the entire size--sort of like the Net tab of Firebug.

Answer 1

The web developer toolbar does this with two clicks:

Information -> View Document Size

And it has a ton of other handy features!

Answer 2

YSlow works great for me (have a look at the statistics tab).