AllTab ScreenShoter is a free Chrome add-on developed by 【公認】ピコリット宣伝bot　-Picolit Official Promotion BOT-. This add-on allows users to capture a single screenshot of all currently open tabs in the browser, merged side by side.

With AllTab ScreenShoter, users can easily capture a comprehensive view of their browsing sessions. This can be especially useful for research, presentations, or simply for personal reference. The add-on is designed to compact the main code, ensuring efficient performance.

It should be noted that if there are too many open tabs, exceeding a certain data size of 50MB, the add-on will issue a warning and abort the process. Additionally, if a "new tab" is opened with a middle-click on the wheel and has never been activated, the capture may fail. Similarly, Single Page Application (SPA) sites that do not transition between pages may not capture screenshots effectively. Furthermore, headers and other elements that follow scrolling may not be captured accurately.

Overall, AllTab ScreenShoter provides a convenient way to capture a single screenshot of all open tabs in Chrome, allowing users to easily save and reference their browsing sessions.