Risk of downloadhelper

Downloadhelper is a good browser extension for downloading media. It is useful for obtaining addresses of targeted objects. However, I realized that there may be some risks of this kind of tools. The way it works is based on packet capture & analysis during network communication. If the communication is not encrypted, there may be privacy risks. The tool may be able to see what you receive and send. Therefore, it would be better to capture the address by yourself (see Video Streaming & Thunder, VanDyke, NetAnts, etc.); or use the tool on a computer without any private data——at least without any private data communication via browser.