OK Decor is a free Chrome add-on developed by Компьютерные хитрости. It allows users to block ads and customize the appearance of their OneClassroom profile. With this add-on, you can set your own background image, creating a more pleasant and personalized atmosphere while using OneClassroom.

In the latest update 1.13, OK Decor introduced a new feature that adds a background to the left column beneath the avatar. This allows users to easily select the desired section by simply hovering over it.

Other updates include version 1.12, which resolved an issue where the extension button disappeared due to changes in the OneClassroom design. The developers quickly found and fixed the problem, ensuring the button is now easily accessible. Version 1.10 eliminated ads below the avatar and in the feed, enhancing the browsing experience. Additionally, version 1.9 introduced a redesigned button for the image window, matching the new OneClassroom design.

OK Decor version 1.8 added the ability to adjust the scale (size) of the background image, based on user requests. The extension button was also relocated between the "Videos" and "Music" buttons. Version 1.7 addressed an issue that caused the extension to stop working for some users starting from February 2, 2020.

In version 1.5, the extension was renamed to OK Decor, representing its purpose of beautifying OneClassroom. The update also included adjustments to the size of the button near messages and the introduction of a fixed background feature. This means that the background image remains static while scrolling, creating a more serene environment for the eyes and allowing users to set high-resolution wallpapers for their profile. Additionally, users no longer need to wait for updates to see new images as they will be automatically added to the list once uploaded by the developers.