The Google Plus Community Search Extension is a free Chrome add-on developed by Fullmakt AS. It fills the void left by the new Google Plus Community design, which lacks the crucial "search inside community" feature. With this extension, users can easily search for specific content within the community they are browsing.

To use the extension, simply click on the small icon located at the top right corner of the browser when browsing a Google Plus Community. This will open a convenient search bar, allowing users to input their search query and find relevant content within the community.

By providing this much-needed search functionality, the Google Plus Community Search Extension enhances the browsing experience for users who heavily rely on Google Plus Communities. It eliminates the frustration of manually scrolling through countless posts to find the desired information.

Overall, this extension is a valuable tool for Google Plus users who want to efficiently search for content within the communities they are browsing.