Perhaps, because win7 is known for being "the last good windows" with some privacy. It may or may not be true, but a lot of people are adamant about not using linux while also trying to maintain privacy, hence they use win7. I imagine such users would probably use a browser like firefox.
Nah there was definitely some kind of fundamental qualitative change from 7 to 8/10. I dont think the post-7 versions of windows will ever be loved like 7
When Windows XP PCs started to become obsolete, one way to extend their life (at least for people that only used them to browse the web) was to install Firefox. I've actually helped someone do this when their freemail provider stopped supporting IE 8. There's people for whom a new computer is an expensive purchase and they will use it until the wheels fall off.
