@AutomatedTester AutomatedTester released this Jun 15, 2018 · 15 commits to master since this release

Note that with this release of geckodriver the minimum recommended
Firefox and Selenium versions have changed:

  • Firefox 57 (and greater)
  • Selenium 3.11 (and greater)


  • Support for the chrome element identifier from Firefox.

  • The unhandledPromptBehavior capability now accepts accept and notify, dismiss and notify, and ignore options.

    Note that the unhandled prompt handler is not fully supported in
    Firefox at the time of writing.


  • Firefox will now be started with the -foreground and -no-remote
    flags if they have not already been specified by the user in

    -foreground will ensure the application window gets focus when
    Firefox is started, and -no-remote will prevent remote commands
    to this instance of Firefox and also ensure we always start a new

  • WebDriver commands that do not have a return value now correctly
    return {value: null} instead of an empty dictionary.

  • The HTTP server now accepts Keep-Alive connections.

  • Firefox remote protocol command mappings updated.

    All Marionette commands changed to make use of the WebDriver:
    prefixes introduced with Firefox 56.

  • Overhaul of Firefox preferences.

    Already deprecated preferences in Firefox versions earlier than
    57 got removed.

  • webdriver crate upgraded to 0.36.0.


  • Force use of IPv4 network stack.

    On certain system configurations, where localhost resolves to
    an IPv6 address, geckodriver would attempt to connect to Firefox
    on the wrong IP stack, causing the connection attempt to time out
    after 60 seconds. We now ensure that geckodriver uses IPv4
    consistently to both connect to Firefox and for allocating a free

  • geckodriver failed to locate the correct Firefox binary if it was
    found under a firefox or firefox-bin directory, depending on
    the system, because it thought the parent directory was the

  • On Unix systems (macOS, Linux), geckodriver falsely reported
    non-executable files as valid binaries.

  • When stdout and stderr is redirected by geckodriver, a bug prevented
    the redirections from taking effect.


@AutomatedTester AutomatedTester released this Apr 8, 2018 · 15 commits to master since this release


  • Avoid attempting to kill Firefox process that has stopped.

    With the change to allow Firefox enough time to shut down in
    0.20.0, geckodriver started unconditionally killing the process
    to reap its exit status. This caused geckodriver to inaccurately
    report a successful Firefox shutdown as a failure.

    The regression should not have caused any functional problems, but
    the termination cause and the exit status are now reported correctly.


@AutomatedTester AutomatedTester released this Mar 12, 2018 · 15 commits to master since this release


  • New --jsdebugger flag to open the Browser Toolbox when Firefox
    launches. This is useful for debugging Marionette internals.

  • Introduced the temporary, boolean capability
    moz:useNonSpecCompliantPointerOrigin to disable the WebDriver
    conforming behavior of calculating the Pointer Origin.


  • HTTP status code for the StaleElementReference error changed
    from 400 (Bad Request) to 404 (Not Found).

  • Backtraces from geckodriver no longer substitute for missing
    Marionette stacktraces.

  • webdriver crate upgraded to 0.35.0.


  • The Firefox process is now given ample time to shut down, allowing
    enough time for the Firefox shutdown hang monitor to kick in.

    Firefox has an integrated background monitor that observes
    long-running threads during shutdown. These threads will be
    killed after 63 seconds in the event of a hang. To allow Firefox
    to shut down these threads on its own, geckodriver has to wait
    that time and some additional seconds.

  • Grapheme clusters are now accepted as input for keyboard input
    to actions.

    Input to the value field of the keyDown and keyUp action
    primitives used to only accept single characters, which means
    geckodriver would error when a valid grapheme cluster was sent in,
    for example with the tamil nadu character U+0BA8 U+0BBF.

    Thanks to Greg Fraley for fixing this bug.

  • Improved error messages for malformed capability values.


@AutomatedTester AutomatedTester released this Oct 31, 2017 · 15 commits to master since this release


  • Search suggestions in the location bar turned off as not to
    trigger network connections

  • Block addons incompatible with E10s


  • Marionette stacktraces are now correctly propagated

  • Some error messages have been clarified


  • Removed obsolete socksUsername and socksPassword proxy
    configuration keys because neither were picked up or recognised


@AutomatedTester AutomatedTester released this Sep 16, 2017 · 15 commits to master since this release

Note that with geckodriver v0.19.0 the following versions are recommended:

  • Firefox 55.0 (and greater)
  • Selenium 3.5 (and greater)


  • Added endpoint:

    • POST /session/{session id}/window/minimize for the Minimize Window
  • Added preference extensions.shield-recipe-client.api_url to disable shield
    studies which could unexpectedly change the behavior of Firefox

  • Introduced the temporary, boolean capability moz:webdriverClick to enable
    the WebDriver conforming behavior of the Element Click command.

  • Added crashreporter environment variables to better control the browser
    in case of crashes

  • Added preference dom.file.createInChild set to true to allow file
    object creation in content processes


  • Log all used application arguments and not only -marionette

  • Early abort connection attempts to Marionette if the Firefox process
    closed unexpectetly

  • Removed deprecated socksProxyVersion in favor of socksVersion

  • Removed ftpProxyPort, httpProxyPort, sslProxyPort, and
    socksProxyPort because ports have to be set for ftpProxy,
    httpProxy, sslProxy, and socksProxy using ":"

  • The proxyType noproxy has been replaced with direct in accordance
    with recent WebDriver specification changes

  • The WindowRectParameters have been updated to return signed 32-bit
    integers in accordance with the CSS and WebDriver specifications, and
    to be more liberal with the input types

  • Mapped the FullscreenWindow to the correct Marionette command

  • To make sure no browser process is left behind when the NewSession
    fails, the process is closed immediately now

  • /moz/addon/install command accepts an addon parameter, in lieu of
    path, containing an addon as a Base64 string (fixed by Jason Juang)

  • webdriver crate upgraded to version 0.31.0

  • mozrunner crate upgraded to version 0.5.0


  • Removed the following obsolete preferences for Firefox:
    • browser.safebrowsing.enabled
    • browser.safebrowsing.forbiddenURIs.enabled
    • marionette.defaultPrefs.port
    • marionette.logging


@andreastt andreastt released this Jul 11, 2017 · 15 commits to master since this release


  • RectResponse permits returning floats for width and height fields
  • New type CookieResponse for the GetNamedCookie command returns a single cookie, as opposed to an array of a single cookie
  • To pick up a prepared profile from the filesystem, it is now possible to pass ["-profile", "/path/to/profile"] in the args array on moz:firefoxOptions
  • geckodriver now recommends Firefox 53 and greater
  • Version information (--version) contains the hash from from the commit used to build geckodriver
  • geckodriver version logged on startup
  • webdriver crate upgraded to version 0.27.0
  • mozrunner crate upgraded to version 0.4.1


  • The SetTimeouts command maps to the Marionette setTimeouts command, which makes geckodriver compatible with Firefox 56 and greater
  • Linux x86 (i686-unknown-linux-musl) builds are fixed


@AutomatedTester AutomatedTester released this Jun 9, 2017 · 15 commits to master since this release


  • Added endpoints:
    • POST /session/{session id}/window/fullscreen to invoke the window manager-specific full screen operation
    • POST /session/{session id}/moz/addon/install to install an extension [Gecko only]
    • POST /session/{session id}/moz/addon/uninstall to uninstall an extension [Gecko only]


  • Increasing the length of the network.http.phishy-userpass-length preference will cause Firefox to not prompt when navigating to a website with a username or password in the URL
  • Library dependencies upgraded to mozrunner 0.4 and mozprofile 0.3 to allow overriding of preferences via capabilities if those have been already set in the profile
  • Library dependencies upgraded to mozversion 0.1.2 to only use the normalized path of the Firefox binary for version checks but not to actually start the browser, which broke several components in Firefox on Windows


  • The SetWindowRect command now returns the WindowRect when it is done
  • Use ASCII versions of array symbols to properly display them in the Windows command prompt
  • Use SessionNotCreated error instead of UnknownError if there is no current session


@AutomatedTester AutomatedTester released this Apr 26, 2017 · 23 commits to master since this release


  • Read Firefox version number from stdout when failing to look for the application .ini file (fixes Selenium #3884)
  • Session is now ended when closing the last Firefox window (fixes #613)


@AutomatedTester AutomatedTester released this Apr 21, 2017 · 28 commits to master since this release

Note that geckodriver v0.16.0 is only compatible with Selenium 3.4 and greater.



  • Removed following list of unused endpoints:
    • GET /session/{session id}/alert_text
    • POST /session/{session id}/alert_text
    • POST /session/{session id}/accept_alert
    • POST /session/{session id}/dismiss_alert
    • GET /session/{session id}/window_handle
    • DELETE /session/{session id}/window_handle
    • POST /session/{session id}/execute_async
    • POST /session/{session id}/execute


  • SendKeysParameters, which is used for the Element Send Keys and Send Alert Text commands, has been updated to take a string text field
  • CookieResponse and CloseWindowResponse fixed to be properly wrapped in a value field, like other responses
  • Allow negative numbers for x and y fields in pointerMove action
  • Disable Flash and the plugin container in Firefox by default, which should help mitigate the “Plugin Container for Firefox has stopped wroking” problems many users were reporting when deleting a session
  • Preferences passed in a profile now take precedence over set of default preferences defined by geckodriver (fixed by @DrMarcII)
    • The exceptions are the marionette.port and marionette.log.level preferences and their fallbacks, which are set unconditionally and cannot be overriden
  • Remove default preference that disables unsafe CPOW checks
  • WebDriver library updated to 0.25.2


  • Fix for the “corrupt deflate stream” exception that sometimes occured when trying to write an empty profile by @kirhgoph
  • Recognise sslProxy and sslProxyPort entries in the proxy configuration object (fixed by @juangj)
  • Fix “httpProxyPort was not an integer” error (fixed by @juangj)
  • Fix broken unmarshaling of Get Timeouts response format from Firefox 52 and earlier (fixed by @juangj)
  • Allow preferences in moz:firefoxOptions to be both positive- and negative integers (fixed by @juangj)
  • Allow IPv6 hostnames in the proxy configuration object
  • i686-unknown-linux-musl (Linux 32-bit) build fixed
  • Log messages from other Rust modules are now ignored
  • Improved log messages to the HTTPD


@AutomatedTester AutomatedTester released this Mar 8, 2017 · 73 commits to master since this release

IMPORTANT: If you use geckodriver with Selenium, you must upgrade to Selenium 3.3 since this release aligns HTTP responses with the WebDriver standard.



  • All HTTP responses are now wrapped in {value: …} objects per the WebDriver specification; this may likely require you to update your client library
  • Pointer move action’s element key changed to origin, which lets pointer actions originate within the context of the viewport, the pointer’s current position, or from an element
  • Now uses about:blank as the new tab document; this was previously disabled due to bug 1333736 in Marionette
  • WebDriver libary updated to 0.23.0


  • Aligned the data structure accepted by the Set Timeouts command with the WebDriver specification