You could try to get a scanner on it and see what it could be. It is a code 21, so it could be a bad module. It could also be a sensor. Some of the air bad sensors on the core support rot out and get moisture in there.
I wouldn't worry about it. I had a 91 GT that the air bag light would blink for a few days, then I wouldn't see it for weeks. Then it would come back and go away again. When stuff just appears out of nowhere, I tend to just ignore it. The car is old so who cares. I would be concerned if it were a newer car like 99-07, but if you were to sell it, I highly doubt that it would deter somebody from buying a fox body.
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