After installing native client from https://github.com/alexmarcoo/open-in-native-client/releases Open in VLC worked first time. Had to configure location of VLC.exe as I have 64 bit and add-on defaults to 32 bit location. Using on Daily Motion - excellent, thank you. A useful feature to add would be the ability to add playlists - currently using Open in VLC on a playlist link in Daily Motion just opens VLC.exe. And/or the option to add to vlc playlist.
The 'Open in VLC™' browser extension allows users to easily open desired links in the VLC (VideoLAN) media player
It requires a native-client patch to connect the browser with the native VLC application in the user's operating system
The extension is not officially affiliated with VLC or VideoLAN and is maintained independently by its author
Users can report bugs or make feature requests through the addon's homepage