The image is a screenshot of a pop-up window on a mobile device. The window is titled "Firefox for Android: This is for FX for Android 50 and above." The window has a white background with black text. At the top of the window, there is a message that reads "https://support-stage.allizom.org/t5/b/". Below the message, there are two options - "This is for Linux" and "Customize this article". 

At the bottom right corner of the screen, there has a checkbox with the text "Version 50" and a button that says "Linux". This option allows the user to customize the article for Firefox for Android.