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I thought it might be driver related. I had initially installed the 13.8 beta drivers but I uninstalled them and have since installed the latest 7790 driver version 184.108.40.2060 (from April 16) as AMD listed separate drivers for the 7790
GPU-Z shows the temp to be 42C after about 4 hours use (no games running though I do play CS:S now and then.
Disabling the hardware acceleration in Firefox seems to have fixed the problem. I'll monitor it over the next day or so to be sure. If the problem comes back I'll try to underclock the memory at that point. I'm assuming I'll need to use the overdrive feature in CCC to do that.