benderconverter.comは安全ですか？

A nice site for converting videos, however I'm not so sure about some of the content it downloads to your computer. It downloaded and installed the following files on my PC when installing: RadioWMPCore.dll C:\Users\Alexander\AppData\Roaming\Mozilla\Firefox\Profiles\6uhmcpsv.default\extensions\{1392b8d2-5c05-419f-a8f6-b9f15a596612}\components\RadioWMPCore.dll RadioWMPCore.xpt C:\Users\Alexander\AppData\Roaming\Mozilla\Firefox\Profiles\6uhmcpsv.default\extensions\{1392b8d2-5c05-419f-a8f6-b9f15a596612}\components\RadioWMPCore.xpt RadioWMPCoreGecko6.dll C:\Users\Alexander\AppData\Roaming\Mozilla\Firefox\Profiles\6uhmcpsv.default\extensions\{1392b8d2-5c05-419f-a8f6-b9f15a596612}\components\RadioWMPCoreGecko6.dll RadioWMPCoreGecko19.dll C:\Users\Alexander\AppData\Roaming\Mozilla\Firefox\Profiles\6uhmcpsv.default\extensions\{1392b8d2-5c05-419f-a8f6-b9f15a596612}\components\RadioWMPcoreGecko19.dll I'm sure they're all harmless, nothing seems to have happened.