Probably a massive stretch but, it would be great if they re-enabled 2-Player mode in Mario Tennis (Virtual Boy) since it's in the game's code already.

I don't know if it's just my luck but it's been quite some time since I've seen the Raphnet SNES to N64 adapter be in stock, so that being said, is there another suggested, affordable, alternative for having a Mouse connected?

Just for reference, the issue is resolved for me, however I've been using Google Chrome this whole time.

You're not alone, down for me also.