I don’t use the related links at all, so I disabled that.
I haven’t tried that myself, but it would be interesting to see.
Download Alexa Sparky from Mozilla Add-ons
Show Alexa Ranking in Firefox
Up until now, there's been no way to show the Alexa rankings directly in Firefox... if you wanted to see them you had to either use the really great About This Site extension, or use the toolbar for Internet Explorer.
