> All the web browsers used their default configuration, without any add-ons or toolbars installed.
My raw, untested guess is that using Firefox with some strict adblocking/flashblocking etc. tools might reduce its power usage due to less HTTP requests, less CPU/GPU time wasted (though OTOH the add-ons may increase the CPU load to do their job, so it's non-obvious).
My raw, untested guess is that using Firefox with some strict adblocking/flashblocking etc. tools might reduce its power usage due to less HTTP requests, less CPU/GPU time wasted (though OTOH the add-ons may increase the CPU load to do their job, so it's non-obvious).