Any reason why FourthTube is unable to fully play a YT video?

Tomodachi Life - Living the Dream, looks so enjoyable with news ways to create drama and with new hairs and all I am so down to get it

Welp, the internet browser doesn't work anymore for regular searches... RIP (But looking up websites seem to still work, but not all of them seem to load and just gives an error...)

Are modpacks still a thing for SSB4U? or just less common nowadays?