Gelbooru Image Viewer

Controls with keyboard:
 └ Press Tab to navigate to images then press Enter to bring up the image viewer in a post list
   └┬ Left Arrow: Previous image
    ├ Right Arrow / Spacebar: Next image
    ├ Up Arrow: Open the current image's post view webpage
    └ Down arrow: Close the viewer

Controls with mouse:
 └ Click on images to bring up the image viewer in a post list
   └┬ Click again to close the viewer
    ├ Mousewheel Press: Open the current image's post view webpage
    ├ Mousewheel Up: Previous image
    └ Mousewheel Down: Next Image

Userscript menu option:
 └ Current Image mode
   └┬ Sample only: load the sample image of higher resolution ones if available
    └ Always original size: ignore samples

Compatible and designed to work with Gelbooru Endless Scroll