GranBlue POPUP is a Chrome extension designed for fans of the popular game GranBlue Fantasy. Developed by にく, this free extension allows users to display the browser version of the game in the style of the app edition, even after the service has terminated. To launch the extension, simply click on the icon located in the upper right corner of your browser.

One of the main features of GranBlue POPUP is its automatic screen size adjustment, which can be set to display up to three levels by increasing the width. Additionally, the extension offers various other functions that can be customized through the options. These include showing bookmarks, copying IDs (only in the ID screen), mouse and keyboard extensions, and system extensions.

The latest version, 1.4, introduces support for Arcalum and BreakGround, while removing the transition to hell mode. Version 1.3 adds the option to right double-click for a rematch in the result screen, with the default setting being off. Version 1.2 introduces the option to prevent the mystery effect setting of character clicks on the battle screen (default: on), and version 1.1 adds options to prevent the display of the standard menu and the dragging of images, both of which are enabled by default.

Please note that GranBlue POPUP is an informal extension, and users should use it at their own risk. It is important to keep in mind that this extension is not officially supported by the developer or the game's creators.