Video Expansion Controller is a free Chrome extension developed by thromboxy. It falls under the category of Browsers and is classified as an Add-ons & Tools subcategory. This extension enhances the video control options on popular video streaming sites such as YouTube, NicoNico Douga, Amazon Prime Video (Japanese version only), Twitch, TVer, and dAnime Store (discontinued).

With Video Expansion Controller, users can enjoy additional features like speed control buttons, seek buttons, mouse wheel control for seeking and volume adjustment. It also offers the option to hide the marquee area and premium ad links. For NicoNico Douga, it provides features like pausing videos with a screen click, maximizing the screen, and resume playback for general members.

Please note that not all features may work properly on all sites. The extension allows users to customize the settings for each site individually, making it more versatile.

Overall, Video Expansion Controller is a useful Chrome extension for those who want to have more control over their video watching experience on various streaming platforms.