Please use Image Zoom firefox add-on to get zoom functionality for images in Firefox.
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.
Page Zoom - Zoom all images on a web page with a single command or make all images on a page zoom with the browsers text zoom feature .
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