Über dieses Add-on
Easily zoom in, zoom out, fit image to screen or set custom zoom on individual images within a web page. All this can be done by using the context menu or a combination of mouse buttons and scroll wheel. Handy to see the finer details of smaller pics or to make very large pics fit within your screen.
Image Rotation will allow you to rotate an image +90,-90,180 degrees from the context menu.
All this control is customizable from the preferences