could you show your capabilities?
DesiredCapabilities capabilities = new DesiredCapabilities();
capabilities.setCapability("proxy", proxy);
capabilities.setBrowserName("firefox");
capabilities.setVersion("55.0");
capabilities.setCapability("enableVNC", true);
capabilities.setCapability("enableVideo", false);
capabilities.setCapability("timeZone", "Europe/Berlin");
capabilities.setCapability("moz:firefoxOptions", new HashMap<String, Object>() {
{
put("prefs", new HashMap<String, Object>() {{
put("general.useragent.override", "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:55.0) Gecko/20100101 Firefox/55.0");
put("media.peerconnection.enabled", false);
}});
}
});