FYI: it took a while but last month, firefox finally surpassed IE as the most popular browser here (that's data for the month of November).
If you're using a nightly build of Mozilla (anything released after Jan. 8th) you should now have keyboard and iconic shortcuts at MetaFilter, just like in IE for windows.
I added embedded information about pages viewed at MetaFilter, per the link tag. If you're using Mozilla, turn on your Site Navigation Bar link this, and you'll see additional buttons when viewing threads, like this. It makes for a nice alternate interface.