I got this expanding the window and moving the unnecessary portions off-screen. Only downsides are not being able to view private messages without shifting firefox to the right and normal tabs without opening a second window.
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However, you are welcome to reference it
from a new thread; link this with the html
<a href="/bboard/q-and-a-fetch-msg.tcl?msg_id=003KzJ">"Tile Tabs" Add-on for Firefox</a>