This Chrome extension, "日本国内発信ツイートに絞り込み," focuses on refining tweet searches on X (twitter.com) to display posts originating from Japan. It acts as an extension for X (formerly Twitter), allowing users to filter search results by hashtags and keywords to exclusively show posts sent from within Japan. By clicking the extension icon, users can toggle Japanese search on or off in the options menu. The extension automatically reloads the page when on X's search results page.

However, the Japanese search feature is only applicable during hashtag and keyword searches. It does not apply to posts in the recommended tab, followed tab, lists, or communities.