Firefox 3 features an overhauled Page Info dialog (Tools menu, Page Info) that while provides some valuable security and content information it also lacks some elements like the Links and Forms pages many users are already missing.
Links and Forms, a Firefox extension developed by Florian Queze, restores both pages to the Page Info dialog just as they were in Firefox 2 and previous versions.
You can get Links and Forms from Mozilla Add-ons. It’s still labeled as experimental so you will need a Mozilla Add-ons account to install it.
Thanks to CFox for the tip!
Bonus tip: If you use the Page Info dialog a lot, you may want to add a button to open it to the toolbar or bring the original Ctrl + I shortcut back. To get back both, install Page Info Button. Hope to see a status bar icon option soon.