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Selenium throws an exception when running on Firefox

we get this error when we are trying to run a testng annotated java selenium code on firefox: "[testng] com.thoughtworks.selenium.SeleniumException: this.getCurrentWindow is not a function" Then all the other annotations are SKIPPED.

A workaround for such an error would be to put the line of code which gives this error under a try block. In my case it was openReader()

I changed the code as below:

try{
openReader()}
catch(Exception e){System.out.println(e.toString());}

The class should throw the Exception too!

This solved the problem and after the exception is printed, the execution continues!
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