I think you got me wrong. What I meant was that, when you're browsing the web with IE, it is IE which is draining your battery. However, when you're using Firef

I think you got me wrong. What I meant was that, when you're browsing the web with IE, it is IE which is draining your battery. However, when you're using Firefox, it's not only Firefox who drains your battery, but also this always-running IE process. My comment was mostly a joke, I don't know to what extent this might be a thing.