Just a little more info, 12/18 thru 12/24, the six days that I used Firefox 34 570MB of data were used by Firefox, measured by the phone. The phone says that 180MB were used in the foreground, ie. as I requested pages. 390MB were used in the background for (add deity of your choice) knows what. So anyway, with barely any pages loaded FF is using twice as much data in the background as it does when I am actually using it. Something doesn't smell right..........

Try this add-on to save some bandwith on Firefox (this will help for sure when you a are using it, not so sure when not using firefox but should help some): https://addons.mozilla.org/en-US/android/addon/janus-proxy-configurator/?src=search note: this is also a proxy, but it will automatically compress http-using websites. Also, search and download "opera data saver max" in the Google Play App Store to compress ALL of your mobile data, to save LOTS of bandwidth. This compresses all data out of the device, like an internet connection from the Facebook app. But this app (opera data saver max) should help with your Firefox data issues and make it a little faster.