You do taxes online? IN Firefox?

PDF allows forms in documents - I don't know how they work but I assume that means you can fill in the boxes and then save the file with your text saved in the boxes, and then you send that back to the revenue...

And on some installations with Firefox and Adobe reader installed, when Firefox downloads a PDF it embeds the Adobe reader in the Firefox window, so it looks as if Firefox is displaying the PDF but it's really Adobe reader's code that's doing the work.

Anahata