DoH Browser Implementation
DoH browser implementation refers to the native integration of [[dns-over-https|DNS-over-HTTPS]] directly inside web browsers such as Chrome, Firefox, Edge, and Brave, bypassing the operating system's DNS resolver. When DoH is enabled in the browser, DNS queries are encrypted and sent to a user-configured or auto-selected resolver (e.g., Cloudflare's 1.1.1.1, Google's 8.8.8.8), preventing ISPs and on-path observers from monitoring browsing activity at the DNS level. Browser-level DoH differs from system-wide DoH in that it applies only to traffic generated by that browser and may override enterprise DNS filtering policies.
Example
A Firefox user enables 'Increased Protection' mode, which silently switches all browser DNS queries to Cloudflare's DoH resolver, hiding their browsing intent from their ISP even while connected to public Wi-Fi.