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This malicious browser extensions that cause the dfd.pathci.net and dfd.pathci.net popups are made for one thing, and one thing only. To investigate your browsing behavior and to make money by advertisements.
It is advised to always read the Terms and Agreements before installing software on your computer. Do never click too fast thru the installation process [Next] button of software as you will agree to software you might not want to install. If the installer offers a Advanced or Custom option button, click it to find out if there is any other malicious software offered and installed during the installation process.