Given these outputs I vote for Qupzilla because it does not require
GTK stuff and it weights less than a half compared to Chromium (I'm
thinking to live images).
I completely agree with your assessment. I certainly hope that the people who voted for Firefox explain their rationale. If I'm missing something, I would
like to understand it. I can't fathom, considering the circumstances, how someone could choose Firefox other than it is their personal preference.