For the second time in as many weeks, I've wrestled with devices with embedded web servers that didn't play fair with Firefox. Tonight it was a Netgear wireless router. I was able to flash new firmware, but thereafter the web-based console refused to honor form posts (which are rather useful if you're trying to, say, change the device's bloody password). After tearing my hair out and coming close to flinging the damn thing out the window, it occurred to me to try IE. Then all was well.
I suspect there's a flakey web server component that sells into the embedded device market.