5 Ways Firefox Extension New Tab Pages Are Killing Your Browser Performance

The Hidden Performance Cost of New Tab Extensions You install a new tab extension to make your browser nicer. You get weather, a clock, a background image. But then you notice Firefox feels... slower. The new tab hesitates before loading. Your CPU spikes for half a second. Here's what's probably happening — and how the good extensions avoid it. Problem 1: Synchronous localStorage Access on Startup Every new tab load starts fresh. Your extension needs to load settings. The naive approach: // Slow