I used one simple script to remove AI from popular browsers (including Chrome and Firefox)

This article reviews Just The Browser, a free open-source tool that applies managed configurations to Chrome, Edge, and Firefox to strip AI features, telemetry, and other promotional elements; tests showed Copilot mode removed in Edge (though AI prompts remained on the new tab page) and AI mode removed in Chrome, while some Chrome telemetry/sync options still required manual disabling, leading the author to recommend the tool as a simple way to reduce tracking and AI clutter without switching browsers.