Skip to main content

Marionette Web driver and STF

If you were also stuck with Firefox 47 and Selenium 2.53 issue then this is right time to start experimenting with Marionette.  
But Before delving into Marionette, let’s see what a web browser engine is. Web browser engine is a program which renders markup content (i.e. html, xml, images etc) and the format information (i.e. css, xsl etc). It is also known as layout or rendering engine. In simple words, web browser engine is responsible for how you are able to see a web page in a browser, email client or e-book reader. Some of the most popular web browser engines are -


  • Webkit which is used in safari and chrome browsers
  • Gecko used in Firefox, Thunderbird email client


Marionette is WebDriver version for Mozilla’s Gecko engine. It can control both the browser (menu, function etc) also known as chrome (don’t confuse with google chrome browser ;-)) and the content within the browser (something which is of immense value for test automation).


Marionette also follows the client server architecture of other web drivers. Client sends commands to server and server executes them Gecko engine. Marionette ships with Firefox.


Using Marionette -


If you are not using STF then you should follow these steps -


  • Set the path
System.setProperty("webdriver.gecko.driver", "/path/to/geckodriver");


  • And start the Marionette driver
DesiredCapabilities capabilities = DesiredCapabilities.firefox();
capabilities.setCapability("marionette", true);
WebDriver driver = new FirefoxDriver(capabilities);
That’s all and now you are ready to drive firefox using Marionette driver
If you are using STF then you just have to specify browser as *marionette and that’s all. Beware the Marionette is yet new and you may encountered unexpected failures during test run.
Found a bug in Marionette? Check list of existing bugs before filing a new bug.
Found a bug in STF. Please report it on GitHub.


A note from automated tester about Marionette future versions -


Marionette will be turned on by default from Selenium 3, which is currently being worked on by the Selenium community. Ideally when Firefox 52 comes around you will just update to Selenium 3 and, fingers crossed, all works as planned.

Grab the latest version of STF and start experimenting with Marionette :)

Popular posts from this blog

Distributed Load Testing with JMeter

Distributed Testing with JMeter When one JMeter client is not able to offer amount of threads required for load testing then distributed testing is used. In distributed testing - One instance of JMeter client can control number of JMeter instances and collect data from them Test plan does not need to be copied to each server, the client sends it to all servers note - JMeter will run all the threads on all the servers, hence 100 threads on 5 JMeter server would pump 500 threads in total. If many server instances are used, the client JMeter can become overloaded and so the client network connection. This has been improved in latest versions of JMeter by switching to Stripped modes, but you should always check that your client is not overloaded When Client (master) and Server (slave) nodes are on same network (no SSH required) Configure Client Node Herein client is referred as the machine controlling test execution on other JMeter nodes. This is also referred

Using chrome console to test xPath and css selectors

Since the advent of selenium there have been many plugin to test xPath / css selectors but you don’t need any of them if you have chrome browser. Using Chrome console you can test both xPath and css selectors. Launch website to be tested in chrome browser and hit F-12 and you would see chrome console opened in lower pane of application - Hit escape key and console would open another pane to write element locators - And now you can start writing xPath or css selectors in chrome console and test them - The syntax for writing css id - $$(“ ”) And hit the enter key. If your expression is right then html snippet of the application element corresponding to the css selector would be displayed - If you mouse over the html snippet in chrome console then it would highlight the corresponding element in application - If you want to clean console of previously written element selectors then just hit ctrl+L keys and chrome console would be empty again. Pro

XPath and single quotes

I had tough time dealing with XPath and single quote. Though W3C recommends using ' to escape it but I never got it working, let me know if any of you get through. Came across this blog and found that “concat” could be used in this situation. So original XPath expression is – //meta[@name=’DESCRIPTION’][@content=’Tester’s Test’] This is some thing which certainly fails as single quote in “Tester’s” marks it at end of string and then XPath blows up, next trial was – //meta[@name=’DESCRIPTION’][@content=’Tester''s Test’] This does not work despite w3c recommendation! And then I used concat function and split the string as – concat(‘Tester’,”’”,’s Test’) NOTICE that single quote is kept in double quote while other characters are kept in single quotes. So XPath looks as – //meta[@name=’DESCRIPTION’][@content=concat(‘Tester’,”’”,’s Test’)] And this works charm.