They use different SSL libraries/configuration. Chrome uses BoringSSL and other libraries may use OpenSSL or some other library. Besides that the SSL library ma

They use different SSL libraries/configuration. Chrome uses BoringSSL and other libraries may use OpenSSL or some other library. Besides that the SSL library may be configured with different cipher suites and extensions. The solution these impersonators provide is to use the same SSL library and configuration as a real browser.