The Flvto Youtube Downloader extension has not been verified by the security team at Google, and you might want to avoid extensions that have full access to the information you share online. The Flvto Youtube Downloader app is recognized as a Potentially Unwanted Program (PUP), which may allow you to download and convert content from YouTube. You should reconsider following the instructions on /how-to/how-to-install-chrome-plugin-win because you may allow the Flvto Youtube Downloader extension to read all data packets exchanged online. PC users that are looking to install the Flvto Youtube Downloader extension may be suggested to enable the Developer Mode in Chrome and load the unpacked extension manually.