NICO History Saver is a Chrome add-on developed by nasui that allows users to save their viewing history on NicoNico Douga and NicoNico Live. This add-on is created entirely using Chat-GPT, offering minimal functionality and occasionally unstable performance. It serves as a temporary solution until the original platform is updated or a more reliable alternative is developed.

With version 1.2, NICO History Saver has significantly improved its ability to save browsing history without encountering major issues. However, the latest update has removed the popup feature, focusing solely on preserving the viewing history on NicoNico platforms.

This free add-on is a handy tool for NicoNico users who want to keep track of their viewing history. Despite its limited functionality and occasional instability, NICO History Saver serves its purpose as a temporary solution until a more robust alternative becomes available.