RE: What is a preference in webdriver,why we use it and where do we use it??
Firefox preference is a way to set the details of a firefox profile. You can set different conditions for the profile like, you can say that browser should not
auto update itself when launced by
Similarly you can set that extensions should not update them selves automatically by using this statement
You can get a list of complete preferences by typing about:config in the address bar of FF browser and you will get a list of all the available options