The image is a screenshot of a pop-up window on a mobile device. The window is titled "Firefox version 49 and below: This is for Linux. Customize this article." The window has a white background with black text. At the top of the window, there is a message that reads "Nov 16 test article". Below the message, there are two options - "Version 49" and "Linux". At the bottom of the screen, there has a button that says "Version History".