ニコニコ・ブラウザ縮小対応 is a browser extension that allows users to conveniently shrink the browser when using Nico Nico. This extension is specifically designed to work with the new delivery and HTML5 player.

It's important to note a few things about this extension. First, it has not undergone thorough testing, so there may be some bugs or issues that have not been addressed. Additionally, the functionality of the survey feature has not been verified. Furthermore, this extension does not support viewing of broadcasts on the old delivery system or with the Flash player. Lastly, there is a possibility that it may not function correctly after updates to Nico Nico.

Despite these caveats, if you are a frequent Nico Nico user and prefer a smaller browser window while watching videos, ニコニコ・ブラウザ縮小対応 could be a useful tool for you.