Is it possible for a website to detect if Marionette is being used in conjunction with Firefox?

To run Firefox using Selenium, the Geckodriver is necessary due to compatibility issues with the JSON Wire Protocol and the Gecko Engine. The Geckodriver acts as an intermediary between Selenium and the browser by serving commands and translating them with Marionette via an HTTP Server. Can a website detect if the current browser is being controlled by Marionette? I have noticed that accessing a "Marionette Page" is possible by using localhost and the Marionette Port in configuration settings when automating Firefox. Additionally, Firefox displays a robot icon indicating automation. While there seems to be built-in automation detection, can it be accessed externally?

Update: It is correct that different browsers reveal various attributes, but traditional JavaScript detection methods are no longer effective. Previously, Selenium RC could be detected through injecting JavaScript code into the browser. However, with the shift to WebDriver in Selenium 2.0, direct communication with the browser has eliminated simple JavaScript variable detection. Although some browser attributes can be exposed, such as Chrome setting navigator.webdriver to true while Firefox does not, the question remains whether websites can access this information.

javascriptseleniumfirefoxgeckodriverfirefox-marionette

Answer №1

Launching the latest version of firefox with either the --marionette option or setting the MOZ_MARIONETTE=1 environment variable activates marionette control for Firefox. To delve deeper into how this feature functions, take a look at the source code of the most recent Firefox release:

moz.configure

set_define("ENABLE_WEBDRIVER", webdriver)

Reviewing core files like nsCertOverrideService.cpp provides further insights:

#ifdef ENABLE_WEBDRIVER
#  include "nsIMarionette.h"
#endif

#ifdef ENABLE_WEBDRIVER
nsCOMPtr<nsIMarionette> marionette = do_GetService(NS_MARIONETTE_CONTRACTID);
if (marionette) {
  bool marionetteRunning = false;
  marionette->GetRunning(&marionetteRunning);
  if (marionetteRunning) {
    return true;
  }
}

nsCOMPtr<nsIRemoteAgent> agent = do_GetService(NS_REMOTEAGENT_CONTRACTID);
if (agent) {
  bool remoteAgentRunning = false;
  agent->GetRunning(&remoteAgentRunning);
  if (remoteAgentRunning) {
    return true;
  }
}
#endif

Additionally, examining remote/component/moz.build:

XPIDL_SOURCES += [
    "nsIMarionette.idl",
    "nsIRemoteAgent.idl",
]

In remote/components/RemoteAgent.sys.mjs, an indication is made when the debugging port is enabled:

const port = cmdLine.handleFlagWithParam("remote-debugging-port", false);
if (port !== null) {
  enabled = true;

remote/components/Marionette.sys.mjs

// Complements -marionette flag for starting the Marionette server.
// We also set this if Marionette is running in order to start the server
// again after a Firefox restart.
const ENV_ENABLED = "MOZ_MARIONETTE";

this.enabled = Services.env.exists(ENV_ENABLED);

Essentially, --enable-webdriver serves as a configuration option, while --marionette and --remote-debugging-port function as runtime options. Detecting marionette programmatically proves to be difficult, but not impossible.

However, attempting to detect bots through client-side application inspections lacks reliability. It's advised to halt such efforts, as they may lead to futile outcomes. Choosing to engage in bot detection battles can prove fruitless as the opposing developer has the ability to bypass such measures by modifying the application accordingly.

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