Santa Fe
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LCD Clock Extension 0.4.2 There is a way to edit FireFox's userchrome to make the font work.
Here it is. Just try and change the font name and save.
.lcd-labels {
font-family: Digital Readout Thick Upright !important;
font-size: 2.0em !important;
padding: 0px 2px !important;
margin: 0px !important;
}