Very handy:
browser-sync start --proxy "http://mytest.local/adminui.php?view=myview" --files "/usr/share/webapps/myapp/myview" --browser "firefox-developer"
proxy param gets URL to refresh, files param gets dir to observere, browser is the browser binary you want to launch and use. Browsersync has many other options.
Find more information on the Browsersync website.