Miniplayer is a YouTube mode that puts the current video in a "picture-in-picture" so you can continue watching the video while browsing other videos.
I never want to use this mode. However, it is bound to the I keyboard shortcut, which is very easily to accidentally hit. Also this shortcut conflicts with Vimium's, which I would prefer to use instead.
So is there any way to prevent YouTube's miniplayer from activating?