The contemporary desktop browser marketplace increasingly resembles an overstuffed "super-application Frankenstein"—cloud storage, AI chatbots, cryptocurrency wallets, and algorithmic content feeds forcibly crammed beside our address bars. This proliferation raises a fundamental question: as browsers accumulate features, how does their core competency—rendering web pages—actually perform?A browser must excel at its foundational purpose before earning the right to expand functionality. To investigate this question rigorously, we conducted com...