The browser is easy to forget, because it is the window rather than the view. Yet the window shapes what you see. Chrome runs roughly seven in ten browsing sessions worldwide, Safari about 15 percent, Edge around 5 percent and Firefox just over 2 percent. That distribution quietly steers billions of daily decisions about which search engine and which AI assistant a person reaches for first.
Defaults are a discovery channel
Each browser leans toward its maker's ecosystem. Chrome puts Google search and Gemini within easy reach, Edge foregrounds Bing and Copilot, and Safari steers toward Apple and Google. Most people never change a default, so the browser they use nudges which assistant they ask and which answers they see. When one browser holds seven in ten sessions, the assistant it favours starts with an enormous structural advantage before anyone competes on quality at all.
This is why the browser map and the assistant leaderboard belong side by side. The tools that ride on the dominant browser reach audiences the raw app rankings understate, a point we develop in the AI assistant leaderboard for 2026.
What this means for your business
You cannot change what browser your buyers use, but you can make sure you are legible across all the assistants those browsers favour, not just one. Being readable to Google's systems covers most of the Chrome majority, while not neglecting Bing keeps you present on Edge and the Copilot surface. The goal is simple, to be found whichever default your buyer never bothered to change. How that traffic splits by engine sits in where your search traffic comes from.