One of the key features of Niconico mylist search is its incremental search functionality. As users type in the input form, the extension performs a real-time search, instantly narrowing down the video results with each character entered. This makes it incredibly convenient for users to find the exact videos they are looking for, without having to manually scroll through their mylist.

When a video is selected from the search results, Niconico mylist search opens the video page in a new tab, allowing users to watch the video without leaving the mylist page.

Please note that Niconico mylist search currently does not support searching within other users' public mylist pages.

Overall, Niconico mylist search is a valuable extension for Niconico users who frequently navigate through their mylist pages and need a quick and efficient way to search for specific videos within their lists.