Full page zoom was recently added to Firefox 3 but there’s still no user interface to actually zoom in or out a web page.
Fortunately, Ted Mielczarek has released Full Page Zoom, an extension to easily do this in nighltly builds. It adds three buttons you can add to the toolbar for easier access.
There’s not very much to say except it works and it works fast. This definitely puts Firefox zoom on par with Internet Explorer 7 and Opera’s.
You will need a recent nightly to test this extension and functionality. If you don’t feel adventurous, here are a couple of screenshots of a YouTube page in normal view and with a 200% zoom.
YouTube web page with 200% zoom.
You can get Full Page Zoom from Ted Mielczarek web site. Remember it works with Firefox 3 development versions only.