These are parameters you can add to the end of webfortress urls to for example toggle the chat or use an entirely different tileset.

Add these to the end:
?hide-chat=true&tiles=Spacefox.png
?hide-chat=true&tiles=Ironhand.png
?hide-chat=true&tiles=Ironhand_Square.png
?hide-chat=true&tiles=Mayday.png
?hide-chat=true&tiles=Obsidian.png
?hide-chat=true&tiles=Phoebus.png

Additionally, you can use the text= tag to add the following text sets:
t_Phoebus.png
t_ShizzleClean.png
t_Spacefox.png

Like this:

?hide-chat=true&tiles=Spacefox.png&text=t_Phoebus.png