McKayla Is Not Impressed is a free Chrome add-on developed by nicolethenerd. This add-on aims to add a touch of humor to your browsing experience by randomly inserting McKayla Maroney's image into approximately 20% of the images you come across while browsing the web. However, McKayla will always maintain her signature unimpressed expression.

With Version 1.5 updates, the developer has fixed several positioning bugs, including the "giant McKayla" bug that some users found amusing but was unintended. Additionally, a click-to-hide functionality has been added, allowing users to simply left-click on McKayla's image to make her disappear.

Though the developer suggests installing this add-on on your friends' machines without their knowledge, it is important to note that this is not encouraged or endorsed. McKayla Is Not Impressed is meant to be a lighthearted addition to your browsing experience, adding a fun element to your day.