I think my question is clear enough.
Well, let me get this straight.
I'm about to install a Mozilla Firefox browser on my LFS.
I saw that installing the Xulrunner is recommended by the BLFS developers (even though they put it in optional list).
However, I see that installing Xulrunner takes a lot more space than if I install the browser alone.
Furthermore, I see that there is not much use of this package.
So I'm asking, should I install Xulrunner?