This is not to say that it is impossible to do so, but it will either be impractical or unethical to do so. For example, a researcher may be interested in the effect of illegal, recreational drug use (the independent variable(s)) on certain types of behaviour (the dependent variable(s)).
This tutorial was last updated on March 17, 2015 and is only intended for desktop/laptop users running the Mac OS X 10.10.x (or above) operating system. While Apple's Safari is a well-known favorite among Mac users, OS X's default browser is far from the only game in town. With popular alternatives such as Chrome and Firefox available on the platform, along with other formidable options like Maxthon and Opera, it not uncommon to have several browsers installed on the same system.
Windows 10's express settings during an upgrade make Edge the default browser, going so far as to switch from Firefox or Chrome, according to a video made by Mozilla in a test of July 2's build 10162. Edge, introduced in Windows 10, will be the default browser out of the box.