Firefox PDF Extension for Mac OS X
Jean Pierre pointed out a fabulous little extension for Firefox 3 on OSX:

The firefox-mac-pdf extension embeds PDF files right in the browser, so you don’t have to download them, open them with Preview.app and remove the file off your desktop afterwards. It works much like Acrobat, except it uses OSX’s built-in PDFkit.
That’s definitely an extension I’d like to see on AMO.
July 17th, 2008 at 3:29 pm
Pressing Cmd+Plus/Minus will zoom in/out as well.
July 17th, 2008 at 2:42 pm
I stand corrected. Zooming is possible via contextual menus.