The point is, if I want to edit a text file, I don't need to use eclipse. I can use something that hasn't added loads of features. I don't need to use whatever Adobe product, I can use some paint app.

If I want to watch streaming videos, I don't have a choice about how I do that.

Fine Firefox is basically a bloated YouTube app. That doesn't change the fact that it is inefficient (from the pov of my CPU) for doing that.