Alphax (alphasigmax@gmail.com) [050625 17:06]:
Although if a lot of our editors installed the Alexa toolbar, the page views per user would increase quite a lot... :)
http://pages.alexa.com/exec/faqsidos/help/index.html?index=127
I do remember the 'What's related' functionality being built into previous versions of Mozilla. It was actually quite useful.
There are a number of other extensions to show Alexa information, but it's not clear if any of those do in fact send data back to Alexa.
- d.