Hi, hajimeabc. I hope you got this figured out oh so long ago - I saw you had also posted in the MacWorld forums.
The reason you are not getting the popup dialog to use a video player is that you have already, at some point in time, selected your default video player when viewing a movie. In order to allow other video players to be used when viewing video content on the web, you'll need to clear the defaults for your current video player on your device. Settings --> Apps --> {find your current video player --> Clear defaults
Then you can use MX or mobo or other players to view video content.
HTH
The reason you are not getting the popup dialog to use a video player is that you have already, at some point in time, selected your default video player when viewing a movie. In order to allow other video players to be used when viewing video content on the web, you'll need to clear the defaults for your current video player on your device. Settings --> Apps --> {find your current video player --> Clear defaults
Then you can use MX or mobo or other players to view video content.
HTH
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