Well, the Wiki says "Installing Fennec on Nokia N810" actually. I have an N800, but I downloaded it anyway. It seems that it is not properly set up for the on-screen keyboard to activate when the cursor is placed in a text box. You can open the finger keyboard by pressing the center d-pad button once the cursor is in a text box though.

Also, as crabolsky said, it seems extremely buggy (at least on N800). It just closed on my randomly while I was trying something.

Anyone try it on an N810? Having any better luck?